Kotak Mahindra Bank — unnecessary charges debited

Address:

Rohtak, Haryana

Location/place: Rohtak
Name of company/service: kotak mahindra bank
Bank name: Kotak mahindra bank
Branch: Rohtak, Haryana branch
I have a bank account which is maintained on a zero balance.
Recently my account was debited Rs 400, the reason, mentioned was that they cut the balance in a promotion offer according to which the bank will deduce charges if i will not do any transection in the account.
what kind of promotion offer is this! what promotion does it offer to bank and what kind of goodness to it to customer.
please look into matter.
Thanks
Dr virender verma
phone:[protected]