Indian Overseas Bank — services to customer

I am existing customer of savings account holder - iob

By 2nd week of aug - 2017 i have submitted the requesting letter to change my account holder name as per gazette notification and from bank side they to updated. But after that i asked some acknowledgement that with effective date the updation occurs for my records purpose. But they said it is not possible to retrieve the updated correction date from the system. So they asked some time, to cross check with manual submission forms. But today (07-sept-2017) that to not possible.

I am very much disappointed this type of answers from the nationalized banks like iob because nowadays everything come in systematized manner by unable to see from bank side is very worst.