State Bank Of India [SBI] — unauthorised credit card usage

Address:

7-3a gandhi bazar, markapur, prakasam district, Prakasam, Andhra Pradesh, 523316

Dear sir,

Today afternoon around 4'o clock there is an un authorized transactions happened through my credit card in three transactions which has debited the amount around 14000. Someone called me and told me that these transactions are mandatory as it will increase my credit card limit. Also the transaction which has been done is more than the remaining balance in my card. How could it be possible. Please verify the complaint and kindly refund my amount.