HDFC Bank — hdfc bank negative balance in my account

I, atul raj, want to close my account as soon as possible. My account number is[protected]. I can not come to your branch office since i have left jodhpur in 2016. I opened a salary account in hdfc bank in 2015 which required no maintenance minimum balance (Or the account is opened with zero balance requirement). But letter you have converted my account to salary to saving without my permission.
So, kindly close my account
Every quarterly hdfc imposing me -600 charge on me which leads to my account in negative balance which is against rbi policyrbi/2014-15/308 dbr. Dir. Bc. No.47/13.03.00/2014-15 november 20, 2014 which said "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". So, kindly requested to set my account balance to zero and close my account as soon as possible.