user address when free call fix (#42)

 user address when free call fix

Author: keshrisohit

metering/services.py

@@ -30,7 +30,7 @@ def get_free_call_details(self, username, org_id, service_id, group_id=None):
 
     def save_usage_details(self, usage_details_dict):
         # nedd to introduce entities when we enhance  feature to this service right now directly using dicts
-        if is_free_call(usage_details_dict):
+        if not is_free_call(usage_details_dict):
             channel_id = usage_details_dict['channel_id']
             group_id = usage_details_dict['group_id']
             user_address = APIUtilityService().get_user_address(group_id, channel_id)