HDFC Bank — Deduction of AMB charges

My account has been debited twice with Rs.602.50 and Rs.708.00for "AMB CHRG INCL GST" for JAN 2021 and FEB 2021on date 18 march without any prior intimation or alert.

Account Details.
Account number: 5010*9140
Ifsc: Hdfc0000411

If my account was not maintained in the month of January .. then they had to deduct the charges in February so that i can keep maintain my account in that month. How they can debite both at same time..?

I have never been communicated via Email or SMS for any such charges they introduced.

If they can send promotional emails and SMS to their customers then why can't they send an alert about a new charges they impose; so that customer can maintain the balance before it goes below the required amount.

This happened third time with me and its not acceptable in any case. Kindly process the refund for both these debit transactions otherwise I have to CLOSE my account with HDFC Bank forever.