[Resolved]  HDFC Bank — claim of finance charges without sending statement and wrong entry of email address

Address: 411051

Website: Hdfc bank credit card

My card no is [protected].
I was receiving email statement regularkay but it was suddenly stopped.
I applied for change of address for my bank account, but the same was used for credit card purposes without my knowledge.
Unfortunately the data entry is done as [protected]@gmail.com instead of [protected]@gmail.com
As a result email bounced and i did not received statement hence i could nit pay in time.
I requested for statement and paid the amount but finance charges were not paid because this was bank's mistake and it was agreed that finance charges will be reversed.
Billing department just keep adding finance charges on finance charges and increase the amount each month and now i received a notice from bank's advocate.
This is really painful and dirty because these people are just harassing customers because they have a organisation behind.
I have requested many times to check the original form and actual email address there but it looks like they are covering each other.
I even challenged to show the form to me or any third person if the email address written is emkanade or rmkanade but the bank people just respond each email in general words saying "our records" show this information rather than checking who has made the mistake.
I have very bad experiences and mental harassment since last 4 /5 months without my fault.
Can someone take them for a task?
Where can i escalate the matter other than hdfc bank?