Axis Bank — Account closure form submitted on 2011 but now I came to know that negative balance generated for not maintaining minimum balance that

I have account in axis bank from the year 2008 with Kolkata, Kakurgachi Branch. i surrender this account with my debit card, cheque book with account closure form and never used that account and i am went out of state for working in my home town. I received every month account statement one day I called customer care to know about that closed account. But they denyed to give me any information by phone. need to come to own branch. Now i am went to my local branch for asking the status of account they told you have negative balance for not maintaining minimum balance we kept negative balance. They are told that is our business policy. My friend told that as per rbi no negative balance in savings account. I went another time for showing and closing that account but they told why we need to follow those rules. And we didn't received any instructions like that from our bank so you need to clear negative balance to close it.
This type of cheating customers and rbi done by axis bank please take action against these type of cheating banks.