HDFC Bank — Illegally showing negative balance in salary account and not closing it

Address: Arekere, Bangalore

My salary account (In hdfc bank) was created in my first company, so once i left the company and joined somewhere else i had to open another salary account. Now my salary account in hdfc bank has been converted to savings account (Without informing me or warning me) i had called customer care and raised a request to close my account as i did not want to use the account and they did say that they will follow up with the request and close the account. I logged into my account for some reason on 1st september 2020 and i see that i have rs -6000 around in my account. I request you to please take action against this bank.. Thay have no right what so ever to do whatever they want without informing the customer. I just want the account to be get closed