Mobikwik — Fraud transaction from sbi credit card

Address:

1/308 Tavanur, Thamattat House Tavanur

I have lost an amount of Rs.21, 000/-from my credit card today after a fraud transaction. The person called me and told me that your credit card points has expired and amount equivalent to the points will be transferred to my account.And they briefed my credit card number and soon after the call, a message has received in my mobile saying that RS.21, 000/- has done from your credit card using mobikwik.

so i request that i want to get my money back to my credit card since this is a unauthorised transaction.