Minor change to raising deskpro ticket and errors when letter acknowledgement fails.

app/v2/errors.py

@@ -27,23 +27,6 @@ class JobIncompleteError(Exception):
         }
 
 
-class NoAckFileReceived(Exception):
-    def __init__(self, message):
-        self.message = message
-        self.status_code = 500
-
-    def to_dict_v2(self):
-        return {
-            'status_code': self.status_code,
-            "errors": [
-                {
-                    "error": 'NoAckFileReceived',
-                    "message": str(self.message)
-                }
-            ]
-        }
-
-
 class TooManyRequestsError(InvalidRequest):
     status_code = 429
     message_template = 'Exceeded send limits ({}) for today'