Citibank — NRV (minimum balance)

My Number is [protected].

I opened the Citibank account in 2017 and it was a salary account. In the year 2021 branch converted it to a savings bank account and the minimum balance (NRV) which needs to be maintained then will be Rs 100, 000. Which is very difficult for me to maintain. Now every month you have deducted Rs 600/- + SGST 54 + CGST 54 = a total of 708 Rs from my account without my consent and breached the terms & conditions, so I request you to refund my Rs 708/- immediately.
Or
Tell me the process to close the account.