Standard Chartered — Fake transactions on my credit card

Dear Sir,
Re: Credit card no:[protected]

I have experienced all the things, which is like a nightmare to me. On 19th September, 2013 a telephone call came to me from[protected]. The person told me that he is a representative of Airtel and he alarmed me that two similar seems is operating somewhere, he verified my identity, my hand set model, balance and validity of the seam. The fact is that, I have two other Airtel seems which are also registered at my name and these two seams are using by my wife and daughter. The person told me that the two unknown seems, which are not registered in my name, will be stopped immediately. After that several calls and blank messages have come throughout the night from Vodafone no[protected] and it continued till 2 p.m. next day.
On 20th morning I found that a message has come from Standard Chartered Bank that, an online transaction of Rs 950/- has been made against my credit card. I immediately contacted SCB customer care and block my card immediately. I have come to know from them that, total six online transactions have been made from Delhi, Metro area ,total amounting Rs 5,500 /-. They assured me, necessary steps will be taken after proper investigation.