Ing Vysya Bank — Money deduction

Address:

Bangalore, Karnataka

I have zero balance salary account in ING, Vittal mallya road branch, Bangalore. Bank has deducted money from my account as a non maintenance of AMB service charges(in December 2015 and January 2016).
I called customer care number and raised complain but she told me, because I left office so, salary account converted to saving account and I need to maintain monthly average balance 10, 000.
But bank didn't send me any notification before conversion and without informing me bank deduct money.
So, now I want my deducted money return to my account.