Kotak Mahindra Bank — deduction of non maintenance charges without intimation

Address:	Hyderabad, Andhra Pradesh, 500081
Website:	www.kotak.com/personal-banking/convenience-banking/net-banking.html

I have a salary account mahindra bank with account number ([protected]). I left the job in april 2017. No salary credited from three months.
But
I deposited 30000 into the account every month. But few days back they deducted 1416 for the months of may and june as well (As nmc (Non maintenance charges). While opening the account it was told that it's a zero balance account, then how would u deduct the money without intimation.
Kindly look after the issue and i want my money to be credited back.

Thankyou and regards
Vasanth