Mobikwik — fraudulent activity credit card

My father received a call claiming to be from sbi. They (The caller) confirmed his kyc details and asked for further verification - such as alternate credit card, as a reference point. My father gave the credit card number and refused to share any other detail. On completion of the call he receives 3 text messages of three transactions each of 39999 towards mobikwik. None of these three transactions were authorized by him. These are fraudulent transactions. Request the company to reverse these fradulant unauthorized transactions.