[Resolved]  ICICI Bank — Illegal tranaction

I have icici credit card, i received a call from this mob no. ([protected]) from master and visa verification department at icici on 26th - sep-2015. she (executive) told me that icici bank will issue a new master micro chip card on behalf of my existing credit card. so first bank debit the charge of rs.-8320 (same is already been debited) but she 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 credit card got debited with rs.8320 i immediately realized something fraud happened and i reacted quickly to reach icici. i given the whole scene to them and got my card blocked. the transaction is yet to be claimed by the merchant. they icici told me that i need to raise complaint when the transaction is caimed for settlement. i wonder how they (frauds) get my details. please guide me what should i do further?