HDFC Bank — Negative Balance

I was employed in a co. back in 2018 and left it in early 2019 after few months I received a msg that my money was deducted due to non maintenance and it became nill .
I talked to support team they said I have to visit branch and branch employee told me to go to the branch which is 22 km far from my place.
I thought it would stop at 0 but after few month I got msg hat it keeps on deducting and my balance got in negative.
I dropped numerous mails and consumer forums but they dont close it and saying I have to Pay first all the money i.e 6503.
I dont have that much of salary. Please help me out here Its been more than a year fighting over this.