diff --git a/src/v0/destinations/user/transform.js b/src/v0/destinations/user/transform.js
index 766746a97b5..8d186305ba0 100644
--- a/src/v0/destinations/user/transform.js
+++ b/src/v0/destinations/user/transform.js
@@ -1,5 +1,4 @@
 const {
-  CustomError,
   getErrorRespEvents,
   getSuccessRespEvents,
   defaultRequestConfig,
@@ -19,6 +18,11 @@ const {
   createOrUpdateUserPayloadBuilder,
   createEventOccurrencePayloadBuilder
 } = require("./utils");
+const {
+  TransformationError,
+  InstrumentationError,
+  NetworkInstrumentationError
+} = require("../../util/errorTypes");
 
 const { EventType } = require("../../../constants");
 
@@ -36,7 +40,9 @@ const responseBuilder = async (payload, endpoint, method, apiKey) => {
     return response;
   }
   // fail-safety for developer error
-  throw new CustomError("[ User.com ]:: Payload could not be constructed", 400);
+  throw new TransformationError(
+    "Something went wrong while constructing the payload"
+  );
 };
 
 const identifyResponseBuilder = async (message, destination) => {
@@ -57,7 +63,7 @@ const identifyResponseBuilder = async (message, destination) => {
 
 const trackResponseBuilder = async (message, destination) => {
   if (!message.event) {
-    throw new CustomError("[ User.com ]:: parameter event is required", 400);
+    throw new InstrumentationError("Parameter event is required");
   }
 
   let payload;
@@ -76,9 +82,8 @@ const trackResponseBuilder = async (message, destination) => {
     return responseBuilder(payload, endpoint, method, apiKey);
   }
 
-  throw new CustomError(
-    "[ User.com ]:: No user found with given lookup field, Track event cannot be completed if there is no valid user",
-    400
+  throw new NetworkInstrumentationError(
+    "No user found with given lookup field, Track event cannot be completed if there is no valid user"
   );
 };
 
@@ -98,9 +103,8 @@ const pageResponseBuilder = async (message, destination) => {
     endpoint = prepareUrl(endpoint, appSubdomain);
     return responseBuilder(payload, endpoint, method, apiKey);
   }
-  throw new CustomError(
-    "[ User.com ]:: No user found with given lookup field. Page event cannot be completed if there is no valid user",
-    400
+  throw new NetworkInstrumentationError(
+    "No user found with given lookup field. Page event cannot be completed if there is no valid user"
   );
 };
 
@@ -135,16 +139,13 @@ const groupResponseBuilder = async (message, destination) => {
     );
     return responseBuilder(payload, endpoint, method, apiKey);
   }
-  throw new CustomError("[ User.com ] :: No user found with given userId", 400);
+  throw new NetworkInstrumentationError("No user found with given userId");
 };
 
 const processEvent = async (message, destination) => {
   // Validating if message type is even given or not
   if (!message.type) {
-    throw new CustomError(
-      "[ User.com ]:: Message Type is not present. Aborting message.",
-      400
-    );
+    throw new InstrumentationError("Event type is required");
   }
   const messageType = message.type.toLowerCase();
   let response;
@@ -162,9 +163,8 @@ const processEvent = async (message, destination) => {
       response = await pageResponseBuilder(message, destination);
       break;
     default:
-      throw new CustomError(
-        `[ User.com ]:: Message type ${messageType} not supported.`,
-        400
+      throw new InstrumentationError(
+        `Event type ${messageType} is not supported`
       );
   }
   return response;
diff --git a/src/v0/destinations/user/utils.js b/src/v0/destinations/user/utils.js
index 7ae5688f292..7e15fe36242 100644
--- a/src/v0/destinations/user/utils.js
+++ b/src/v0/destinations/user/utils.js
@@ -1,6 +1,5 @@
 const get = require("get-value");
 const {
-  CustomError,
   getHashFromArray,
   constructPayload,
   getIntegrationsObj,
@@ -22,6 +21,10 @@ const {
   groupSourceKeys,
   identifySourceKeys
 } = require("./config");
+const {
+  InstrumentationError,
+  NetworkInstrumentationError
+} = require("../../util/errorTypes");
 
 /**
  * Returns updated User.com url
@@ -205,16 +208,13 @@ const validatePagePayload = message => {
   const timestamp = getFieldValueFromMessage(message, "timestamp");
 
   if (!pageUrl) {
-    throw new CustomError("[ User.com ]:: Parameter url is required", 400);
+    throw new InstrumentationError("Parameter url is required");
   }
   if (!pagePath) {
-    throw new CustomError("[ User.com ]:: Parameter path is required", 400);
+    throw new InstrumentationError("Parameter path is required");
   }
   if (!timestamp) {
-    throw new CustomError(
-      "[ User.com ]:: Parameter timestamp is required",
-      400
-    );
+    throw new InstrumentationError("Parameter timestamp is required");
   }
 };
 
@@ -228,7 +228,7 @@ const validateGroupPayload = message => {
   const traits = getFieldValueFromMessage(message, "traits");
   const { name } = traits;
   if (!name) {
-    throw new CustomError("[ User.com ]:: Parameter name is required", 400);
+    throw new InstrumentationError("Parameter name is required");
   }
 };
 
@@ -346,10 +346,7 @@ const getUserByUserKey = async (apiKey, userKey, appSubdomain) => {
  */
 const getUserByEmail = async (apiKey, email, appSubdomain) => {
   if (!email) {
-    throw new CustomError(
-      "[ User.com ]:: lookup field : email value is not present",
-      400
-    );
+    throw new InstrumentationError("Lookup field : email value is not present");
   }
 
   const endpoint = prepareUrl(
@@ -384,10 +381,7 @@ const getUserByEmail = async (apiKey, email, appSubdomain) => {
  */
 const getUserByPhoneNumber = async (apiKey, phoneNumber, appSubdomain) => {
   if (!phoneNumber) {
-    throw new CustomError(
-      "[ User.com ] :: lookup field : phone value is not present",
-      400
-    );
+    throw new InstrumentationError("Lookup field : phone value is not present");
   }
 
   const endpoint = prepareUrl(
@@ -409,14 +403,12 @@ const getUserByPhoneNumber = async (apiKey, phoneNumber, appSubdomain) => {
     const { response } = processedUserResponse;
     const { results } = response;
     if (results.length === 0) {
-      throw new CustomError(
-        "[ User.com ] :: no user found for a given lookup field",
-        400
+      throw new NetworkInstrumentationError(
+        "No user found for a given lookup field"
       );
     } else if (results.length > 1) {
-      throw new CustomError(
-        "[ User.com ] :: multiple users obtained for a given lookup field",
-        400
+      throw new NetworkInstrumentationError(
+        "Multiple users obtained for a given lookup field"
       );
     } else {
       const [first] = results;
@@ -523,9 +515,9 @@ const retrieveUserFromLookup = async (message, destination) => {
     if (lookupField === "phone") {
       return getUserByPhoneNumber(apiKey, lookupFieldValue, appSubdomain);
     }
-    throw new CustomError(
-      `[ User.com ] :: lookup field : ${lookupField} is not supported for this destination`,
-      400
+
+    throw new InstrumentationError(
+      `Lookup field : ${lookupField} is not supported for this destination`
     );
   } else {
     const userId = getValueFromMessage(message, "userId");
@@ -536,9 +528,9 @@ const retrieveUserFromLookup = async (message, destination) => {
     if (isDefinedAndNotNullAndNotEmpty(email)) {
       return getUserByEmail(apiKey, email, appSubdomain);
     }
-    throw new CustomError(
-      "[ User.com ] :: default lookup field : email value is empty",
-      400
+
+    throw new InstrumentationError(
+      "Default lookup field : email value is empty"
     );
   }
 };
diff --git a/test/__tests__/data/user.json b/test/__tests__/data/user.json
index 3fa08d600a8..5f3ed2a04af 100644
--- a/test/__tests__/data/user.json
+++ b/test/__tests__/data/user.json
@@ -36,7 +36,7 @@
       }
     },
     "output": {
-      "error": "[ User.com ]:: Message Type is not present. Aborting message."
+      "error": "Event type is required"
     }
   },
   {
@@ -77,7 +77,7 @@
       }
     },
     "output": {
-      "error": "[ User.com ]:: Message type trackuser not supported."
+      "error": "Event type trackuser is not supported"
     }
   },
   {
@@ -108,7 +108,7 @@
       }
     },
     "output": {
-      "error": "[ User.com ]:: parameter event is required"
+      "error": "Parameter event is required"
     }
   },
   {
@@ -150,7 +150,7 @@
       }
     },
     "output": {
-      "error": "[ User.com ]:: Parameter name is required"
+      "error": "Parameter name is required"
     }
   },
   {