HDFC Bank — Deduction of minimum balance

This is Aishwarya Patil. I was having my salary account in HDFC bank. Later it was converted to savings account which I was not aware of. I transferred 11000 to my account but bank has deducted minimum charges of 6140 rupees in a single day without any intimation. We visited the base branch (HDFC bank Shivanagar branch Bangalore) requesting to reverse the minimum charges by stating we were not aware of this. But there is no proper response from the branch. We request you to kindly check on the complaint.