Citi Bank — credit card fraud

DEAR SIR / MADAM, I have been charged by fraud person called from number [protected] on 2nd April 2015 10:09 am, who claimed that he is from CITI bank main branch and my credit card need to be upgraded due to new Rules made by RBI else the present card will be blocked due to new CITI bank policy, he also said my card first 8 digits and Name that made me believe he is a true caller from CITI Bank. So please take necessary action on this cheater. I have got Three messages saying my card ([protected]) is spent at AIRTEL PAYMENT for Rs 5070/- Mobikwik payment for Rs. 4000/- & 5000/- (Total 14070/-). Immediate I have spoken to my CITI Bank Customer care & informed them regarding false / Fraud transaction and advice to block the card. I also log the complaint (Complain No – 99443) for the same. The card was blocked. The customer care representative told that they will investigate the issue and raise the Dispute after 4-5 days & also inform that there is no need to log FIR with police station or Cyber Cell. After 09 Days I got call from CITI bank as per them they have raise dispute against AIRTEL PAYMENT for Rs 5070/ (Dispute No- I[protected] Dt:11.04.2015) but not able to raise dispute against Mobikwik Payment 4000/- & 5000/- due to secure payment. So I want to Know:- 1) If First payment (AIRTEL Payment Rs. 5070/-) is disputed then how Second & Third Payment (Mobikwik Payment Rs. 4000/- & 5000/-) is not disputed First Payment 5070/- done on 10:32 am on 02.04.2015 Second Payment 4000/- done on 10:35 am on 02.04.2015 Third Payment 5000/- done on 10:37 am on 02.04.2015 (Means every payment done in 02 minute gape) 2) As per CITI Bank Customer Care Representative there is no need to log FIR with police station or Cyber Cell they will resolve the issue with the help of their IT team then why after 09 days they are saying to log FIR with Cyber Cell or Police Station. (I have doubt that Cyber Cell or Police will help me after 09 days) 3) I was surprised to know that even if alert customer is calling them and informing them of fraudulent transaction, the customer service is not taking prompt action to find out where and how the fraud happened. They were not even able to tell the merchant's name and location. Do not know what to do, I need your help to sort out the issue