HDFC Bank — Unauthorized ACH Debit Return Charges

Address:

HDFC Bank Limited

I have my salary account in HDFC Bank from last 7 years. I had Rs 18144/- in my account as on 07/Sep/2022. My total amount of Rs 18144/- has been debited for some charges mentioned as "ACh Debit Return Charges" with out any intimation. I did not authorize those all the charges. The bank has to let us know all the information for each debit and credit. They do not have any right to debit or to keep in negative balance. I want HDFC bank to refund all the amount Immediately. Is this a small amount to debit at a time?