HDFC Bank — Non Maintenance charges

I have opened a Salary account in HDFC Bank 30/06/2019 in Coimbatore. Later on september, i left that Job and moved to jordan. And i couldnt use that account. But now the balance is showing as -5200. As they have changed the salary account to normal savings account and they have charged for the non maintanance of minimum balance. Iam not informed about this. And even they inform iam not able to close or send any money to that account since its not an NRI account. I dont want to use that account anymore. Need to close it.. but i really dont want to pay the charges just for closing.
What should i do?

Niyas