Punjab National Bank [PNB] — I am complaining about the illegar QAB charges being deducted from my bank account

I have a savings account with Punjab National Bank, Survey of India branch. The bank has deducted Rs 225 as QAB charges from my account for not maintaining the minimum quarterly balance. But, the bank has never issued such guidelines that there is a minimum balance that the customer is required to maintain. Moreover, I was not informed by the bank about these charges being deducted. I request you to initiate a refund of the charges levied illegally from mh bank account.