Mobikwik — fraudulent transaction via debit card

I would like to bring this into your kind notice that today from 11.16 am to 11:30 am four unauthorized transactions took place from my father's icici bank debit card no:#3 of amounts rs 5000 /-, 5000/-, 3000/- and 1000/- at mobikwik. Earlier he got a call on his mobile from mobile number [protected] and the person claimed that he was calling from icici debit card department and my father's credit card has been blocked and he would require the card no. To unblock it and as my father have no knowledge about the debit card transaction process he shared the card no. And cvv no. Too. When the call was over he got sms from icici bank stating transactions of the above said amounts. So total amount was of rs 14000/- which was out from my father's account. As soon as i came to know about this i got the debit card blocked and now i need your help to cancel all the above transactions as soon as possible. Further please do the needful on urgent basis and revert on this mail [protected]@gmail.com