diff --git a/app/celery/nightly_tasks.py b/app/celery/nightly_tasks.py
index f4dd5e491..51fdf0f70 100644
--- a/app/celery/nightly_tasks.py
+++ b/app/celery/nightly_tasks.py
@@ -257,11 +257,14 @@ def letter_raise_alert_if_no_ack_file_for_zip():
 
     if len(zip_file_set - ack_file_set) > 0:
         if current_app.config['NOTIFY_ENVIRONMENT'] in ['live', 'production', 'test']:
-            zendesk_client.create_ticket(
+            ticket = NotifySupportTicket(
                 subject="Letter acknowledge error",
                 message=message,
-                ticket_type=zendesk_client.TYPE_INCIDENT
+                ticket_type=NotifySupportTicket.TYPE_INCIDENT,
+                technical_ticket=True,
+                ticket_categories=['notify_letters']
             )
+            zendesk_client.send_ticket_to_zendesk(ticket)
         current_app.logger.error(message)
 
     if len(ack_file_set - zip_file_set) > 0:
diff --git a/tests/app/celery/test_nightly_tasks.py b/tests/app/celery/test_nightly_tasks.py
index 6f9a6c288..af29ff55e 100644
--- a/tests/app/celery/test_nightly_tasks.py
+++ b/tests/app/celery/test_nightly_tasks.py
@@ -374,7 +374,11 @@ def test_letter_raise_alert_if_no_ack_file_for_zip_does_not_raise_when_files_mat
 @freeze_time('2018-01-11T23:00:00')
 def test_letter_raise_alert_if_ack_files_not_match_zip_list(mocker, notify_db):
     mock_file_list = mocker.patch("app.aws.s3.get_list_of_files_by_suffix", side_effect=mock_s3_get_list_diff)
-    mock_zendesk = mocker.patch("app.celery.nightly_tasks.zendesk_client.create_ticket")
+    mock_create_ticket = mocker.spy(NotifySupportTicket, '__init__')
+    mock_send_ticket_to_zendesk = mocker.patch(
+        'app.celery.nightly_tasks.zendesk_client.send_ticket_to_zendesk',
+        autospec=True,
+    )
 
     letter_raise_alert_if_no_ack_file_for_zip()
 
@@ -387,11 +391,15 @@ def test_letter_raise_alert_if_ack_files_not_match_zip_list(mocker, notify_db):
                                       current_app.config['LETTERS_PDF_BUCKET_NAME'],
                                       datetime.utcnow().strftime('%Y-%m-%d') + '/zips_sent',
                                       current_app.config['DVLA_RESPONSE_BUCKET_NAME'])
-    mock_zendesk.assert_called_once_with(
+    mock_create_ticket.assert_called_once_with(
+        ANY,
         subject="Letter acknowledge error",
         message=message,
-        ticket_type='incident'
+        ticket_type='incident',
+        technical_ticket=True,
+        ticket_categories=['notify_letters']
     )
+    mock_send_ticket_to_zendesk.assert_called_once()
 
 
 @freeze_time('2018-01-11T23:00:00')