HDFC Bank — Ach charges

My salary account in hdfc bank but from month October to April 590 and more different amounts asACH charges are Debit from my Account, , narration ACH (auto debit return charges)..why are you debit these charges without giving any intimation and i repay all the amount and but still from october ..as per the RBI guidance 3 month relief will be provided to all due to covid 19 and this really rubbish bank my situation very low till time and am not have in the situation to pay that some ach debit return charges without any action and without giving any reminder or notification please i request to refund this amount back.. Kindly help me as soon as possible.still my account is debited and one part of my savings is on hold.