Just a heads up, HDFC bastards converted my sisters salary account to savings bank account and then levied MAB fees for 2 years till the balance went to negative. Her friend by mistake deposited money into it and all the money, 5k, was deducted. Had to fight for few days and threats of complaining to ombudsman to remove those charges and close the account for sure.
If you're not using that account, better just close it. You can easily open another account in any other bank offering zero balance feature.