ICICI Bank — Credit card fraud case

Address:

400082

I have icici credit card, i received a call from this mob no. ([protected]) from master and visa verification department at icici on 29-aug-2016. He (Executive, abhinav bhatacharya) told me that icici bank will issue a new visa coral contactless icici card on behalf of my existing credit card. So first bank debit the charge of rs.-8500 (Same is already been debited) but he assured that it will be adjusted through reward points and the same amount will be credited to my account before generating my bill. I was hesitating to provide otp but somehow i given otp. Immediately my account got debited with rs.8, 429/-. I immediately realized something fraud happened and i reacted quickly & called icici customer care number. I given the whole scene to them and got my card blocked. Thea transaction is yet to be claimed by the merchant. They icici told me that i would raise complaint when the transaction is claimed for settlement or contact police cyber cell. I wonder how they (Frauds) get my details. Please guide me what should i do further?