RBL Bank — help regarding bank account closure

I had an executive salary savings account with rbl bank ltd. Which stopped getting credited with salary after march 2016, when i left my job. After that it got converted into a savings account. I haven’t been using the account since the past year and do not wish to use it in the future. The account has no balance whatsoever since the same time. Also, i also have no access to the phone number associated with that account.

I had to settle back in my hometown due to personal reasons and since then i have been unable to visit the home branch where i had my account (Noida, sec 18). There is no branch of rbl bank in my hometown (Bulandshahr, u. P.) and when i called customer care in regard of closing my account, they were unable to help since i had non-maintenance charges pending against the account. Since, i have no access to the phone number associated with the account or a local branch, i wasn’t aware about the same. Kindly waive any non-maintenance charges, if there are any, as i will not be able to pay them due to financial instability. I[censored]nable to close it, i’ll have no option but to let it get dormant. It will not affect my cibil score but still it feels inconvenient to have a dormant account.

Please guide me on how to close this account.