diff --git a/app/celery/tasks.py b/app/celery/tasks.py
index 1948c0964..2928a29f3 100644
--- a/app/celery/tasks.py
+++ b/app/celery/tasks.py
@@ -421,12 +421,11 @@ def update_letter_notifications_statuses(self, filename):
         for update in notification_updates:
             check_billable_units(update)
             update_letter_notification(filename, temporary_failures, update)
-            sorted_letter_counts[update.cost_threshold] += 1
+            sorted_letter_counts[update.cost_threshold.lower()] += 1
 
         try:
-            if sorted_letter_counts.keys() - {'Unsorted', 'Sorted'}:
-                unknown_status = sorted_letter_counts.keys() - {'Unsorted', 'Sorted'}
-
+            unknown_status = sorted_letter_counts.keys() - {'unsorted', 'sorted'}
+            if unknown_status:
                 message = 'DVLA response file: {} contains unknown Sorted status {}'.format(
                     filename, unknown_status
                 )
@@ -455,8 +454,8 @@ def persist_daily_sorted_letter_counts(day, file_name, sorted_letter_counts):
     daily_letter_count = DailySortedLetter(
         billing_day=day,
         file_name=file_name,
-        unsorted_count=sorted_letter_counts['Unsorted'],
-        sorted_count=sorted_letter_counts['Sorted']
+        unsorted_count=sorted_letter_counts['unsorted'],
+        sorted_count=sorted_letter_counts['sorted']
     )
     dao_create_or_update_daily_sorted_letter(daily_letter_count)
 
@@ -485,7 +484,7 @@ def update_letter_notification(filename, temporary_failures, update):
         msg = "Update letter notification file {filename} failed: notification either not found " \
               "or already updated from delivered. Status {status} for notification reference {reference}".format(
                   filename=filename, status=status, reference=update.reference)
-        current_app.logger.error(msg)
+        current_app.logger.info(msg)
 
 
 def check_billable_units(notification_update):
diff --git a/tests/app/celery/test_ftp_update_tasks.py b/tests/app/celery/test_ftp_update_tasks.py
index 436846827..70e1479b7 100644
--- a/tests/app/celery/test_ftp_update_tasks.py
+++ b/tests/app/celery/test_ftp_update_tasks.py
@@ -94,7 +94,7 @@ def test_update_letter_notifications_statuses_raises_error_for_unknown_sorted_st
         update_letter_notifications_statuses(filename='NOTIFY-20170823160812-RSP.TXT')
 
     assert "DVLA response file: {filename} contains unknown Sorted status {unknown_status}".format(
-        filename="NOTIFY-20170823160812-RSP.TXT", unknown_status="{'Error'}"
+        filename="NOTIFY-20170823160812-RSP.TXT", unknown_status="{'error'}"
     ) in str(e)
 
 
@@ -185,7 +185,7 @@ def test_update_letter_notifications_statuses_persists_daily_sorted_letter_count
 ):
     sent_letter_1 = create_notification(sample_letter_template, reference='ref-foo', status=NOTIFICATION_SENDING)
     sent_letter_2 = create_notification(sample_letter_template, reference='ref-bar', status=NOTIFICATION_SENDING)
-    valid_file = '{}|Sent|1|Unsorted\n{}|Sent|2|Sorted'.format(
+    valid_file = '{}|Sent|1|uNsOrTeD\n{}|Sent|2|SORTED'.format(
         sent_letter_1.reference, sent_letter_2.reference)
 
     mocker.patch('app.celery.tasks.s3.get_s3_file', return_value=valid_file)
@@ -195,7 +195,7 @@ def test_update_letter_notifications_statuses_persists_daily_sorted_letter_count
 
     persist_letter_count_mock.assert_called_once_with(day=date(2017, 8, 23),
                                                       file_name='NOTIFY-20170823160812-RSP.TXT',
-                                                      sorted_letter_counts={'Unsorted': 1, 'Sorted': 1})
+                                                      sorted_letter_counts={'unsorted': 1, 'sorted': 1})
 
 
 def test_update_letter_notifications_statuses_persists_daily_sorted_letter_count_with_no_sorted_values(
@@ -317,7 +317,7 @@ def test_get_billing_date_in_bst_from_filename(filename_date, billing_date):
 
 @freeze_time("2018-01-11 09:00:00")
 def test_persist_daily_sorted_letter_counts_saves_sorted_and_unsorted_values(client, notify_db_session):
-    letter_counts = defaultdict(int, **{'Unsorted': 5, 'Sorted': 1})
+    letter_counts = defaultdict(int, **{'unsorted': 5, 'sorted': 1})
     persist_daily_sorted_letter_counts(date.today(), "test.txt", letter_counts)
     day = dao_get_daily_sorted_letter_by_billing_day(date.today())