Paytm Mobile Solutions — fraud transaction in the phone call

Hi,

I've found a fraud transaction yesterday evening of about 9000 rupees in my credit card it was paid for paytm mobile solutions company.. Since we gave the card number as it was mentioned that this was the call from the bank. As soon as i found it was fraud and i requested the bank to block the card. Kindly help me with this. Since i want the transaction to be cancelled.