[Resolved]  Citibank Credit Card — Fraud on my credit card

A fraud has taken place on my citibank credit card, somebody did online transaction and made a payment of Rs.45000 from my credit card. I have requested bank to give me the details of payment and told them that these are not my transactions and nor did i ever gave my card to anybody so how come the details were leaked of my card. After the investigation the bank has come to me by saying that the transactions are all secured online transactions and is done by me, whereas i never did those transactions and they are not mine. I told bank that i will not pay the money because these are all disputed transactions and i want complete details of those transactions. To this the bank replied that they have only this much details that the payment is made towards BHARTI CELLULAR LIMITED and don't have full details on whose name or number the payment has been done. I told the bank that these details are not enough and i want complete details and iam not going make any payment of these transactions.
Kindly help me on this all above happenings as iam really afraid of the banks collection department who may harrass me for the collections.