HDFC Bank — Hdfc bank negative balance in my account

Address:

Mumbai City, Maharashtra, 400064

My salary account(in HDFC bank) was created in my first company, so once i left the company and joined other company and there was no credit of salary into my HDFC bank 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. After that i never logged in to my account through net banking and didnt do any transaction from while. Now, when I logged into my account on 5th April 2016 and i see that i have Rs -4000 in my account. I request you to please take action against this bank..They have no right what so ever to do whatever they want without informing the customer.

My bank account number:

Bank address:
China Link, Ground Floor, Opposite Goregaon Sport Club, Link Road, Malad Westmumbai, Greater Mumbai - 400064
City & District : Mumbai
State : Maharashtra