[Resolved]  HDFC Bank — showing negative balance on saving account

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)
Please take serious action on that matter
As per rbi rules and regulations bank can't charge extra amount from their customers.