diff --git a/backend/metering_billing/billable_metrics.py b/backend/metering_billing/billable_metrics.py
index 05de47285..39239d8d5 100644
--- a/backend/metering_billing/billable_metrics.py
+++ b/backend/metering_billing/billable_metrics.py
@@ -28,6 +28,7 @@
 )
 from metering_billing.utils import (
     convert_to_date,
+    convert_to_datetime,
     date_as_min_dt,
     now_utc,
     periods_bwn_twodates,
@@ -799,7 +800,11 @@ def get_usage(
             )
         )
         now = now_utc()
-        plan_periods = [x for x in plan_periods if x <= end and x <= now]
+        plan_periods = [
+            x
+            for x in plan_periods
+            if x <= convert_to_datetime(end, date_behavior="max") and x <= now
+        ]
         # for each period, get the events and calculate the usage
         usage_dict = {}
         for customer_name, cust_usages in period_usages.items():
diff --git a/backend/metering_billing/serializers/model_serializers.py b/backend/metering_billing/serializers/model_serializers.py
index 86a5998a4..e9ebebc0c 100644
--- a/backend/metering_billing/serializers/model_serializers.py
+++ b/backend/metering_billing/serializers/model_serializers.py
@@ -1557,19 +1557,32 @@ def validate(self, data):
         data = super().validate(data)
         # check that the customer ID matches an existing customer
         try:
-            data["customer"] = Customer.objects.get(customer_id=data["customer_id"])
+            data["customer"] = Customer.objects.get(
+                customer_id=data["customer_id"],
+                organization=self.context["organization"],
+            )
         except Customer.DoesNotExist:
             raise serializers.ValidationError(
                 f"Customer with customer_id {data['customer_id']} does not exist"
             )
+        except Customer.MultipleObjectsReturned:
+            raise ServerError(
+                "Something went wrong with the database state. Please allow us to investigate!"
+            )
         # check that the plan ID matches an existing plan
         if data.get("plan_id"):
             try:
-                data["plan"] = Plan.objects.get(plan_id=data["plan_id"])
+                data["plan"] = Plan.objects.get(
+                    plan_id=data["plan_id"], organization=self.context["organization"]
+                )
             except Plan.DoesNotExist:
                 raise serializers.ValidationError(
                     f"Plan with plan_id {data['plan_id']} does not exist"
                 )
+            except Plan.MultipleObjectsReturned:
+                raise ServerError(
+                    "Something went wrong with the database state. Please allow us to investigate!"
+                )
         return data
 
 
diff --git a/backend/metering_billing/views/model_views.py b/backend/metering_billing/views/model_views.py
index ab4e742ee..3dcd45fdd 100644
--- a/backend/metering_billing/views/model_views.py
+++ b/backend/metering_billing/views/model_views.py
@@ -774,9 +774,13 @@ def get_queryset(self):
                 parsed_params = json.loads(raw_filters)
                 dict_params["subscription_filters"] = parsed_params
             if self.action == "update_plans":
-                serializer = SubscriptionRecordFilterSerializer(data=dict_params)
+                serializer = SubscriptionRecordFilterSerializer(
+                    data=dict_params, context={"organization": organization}
+                )
             elif self.action == "cancel_plans":
-                serializer = SubscriptionRecordFilterSerializerDelete(data=dict_params)
+                serializer = SubscriptionRecordFilterSerializerDelete(
+                    data=dict_params, context={"organization": organization}
+                )
             serializer.is_valid(raise_exception=True)
             args = []
             args.append(Q(status=SUBSCRIPTION_STATUS.ACTIVE))