HDFC Bank — hdfc bank amount wrongly deducted under dc intl pos txn markup + st

Amount wrongly deducted under dc intl pos txn markup + st from my act without my notice from june 1st till date.

I've used debit card once for transaction via binomo trading app and now my binomo account is closed and its one months and till hdfc bank is debiting the amount every week.

As per my understanding this is "txn - transaction. Markup - foreign currency markup. St - service tax. It is the foreign currency markup charges charged to your card for doing swiping your card at an international location.... Hdfc bank charges 3.5 of the transaction amount as a fee for using your debit card for a transaction in foreign currency."