Axis Bank — negative balance in savings a/c

My company opened a salary account in axis bank in june 2015 i worked there around a year & later on there was no credit of salary so it was automatically converted to savings account.

Since past 6 or 8 months i was not actively using the account & minimum account balance was also less than 10, 000 so i was charged around ₹600 & later on my balance went in negative as i was not using this account as i'm pursuing my masters. So currently it has gone to -1500 (Negative). I visited my nearest branch & requested them to waive off atleast the negative balance charges as i wish to close my account. But they refuse to waive of the charges.

I wish to close the account now.