HDFC Bank — HDFC Bank negative balance in my account

Address:

110029

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 for query 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. I see negative balance now in my that inactive account today. 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. Even RBI has confirmed that "It should be ensured that the balance in the savings account does not turn into negative balance solely on account of levy of charges for non-maintenance of minimum balance." - RBI