How Charges Hdfc Bank AMB

Location/place: Gurgaon

Name of company/service: Gour Krishna Shyamal

They charged Rs. 393.26 from my account stating AMB Charges incl st & cess for May2012 what the hell!!! these private banks are withdrawing amount without any intimation!!! shame!!!
Thanks
Gour Krishna Shyamal
9873569313