1. Change your user name and password of credit card immediately.
2. Issue a legal notice to ICICI prudential Life .It is absolutely a wrong committed by the bank by using your credit card with out your permission.
3. A case can be filed before the Bank Ombudsman as well and damages could be filed for deficiency in service before the Consumer court.
More details about credit card and its regulations applicable in Inida ,issued by RBI visit :
http://rbi.org.in/scripts/BS_ViewMasCirculardetails.aspx?id=8087
How does credit card fraud occur?
Credit card fraud happens when consumers give their credit card number to unfamiliar individuals, when cards are lost or stolen, when mail is diverted from the intended recipient and taken by criminals, or when employees of a business copy the cards or card numbers of a cardholder.Never provide your credit card number or other personal information on the phone, unless you are able to verify that you are speaking with your financial institution or a merchant you trust. Don't give your account number to anyone who calls you on the phone.