Consumer Redressal

I have SBI credit card since last one and a half year. At the time of issuing the same I was told that this is free and with this you can save surcharge on petrol on any petrol pump. I am not using any credit card but just for benifit of surcharge on petrol I took card. After 2-3 months I enquire about this on petrol pump and they said there is no such discount on SBI card. Since then I am trying to contact the SBI credit card department for guidence to cancel the card but when I call customer care no, there are many input options but no input option for cancellation of card. Mean while I was able to contact customer care supervisor by dialling any random no.but after telling about cancelation of card they divert the call to other no, where no attendant is present. I got many calls about new SBI card also. If I ask about assistance for card cancellation they cut the conversation.This process is on since last one and a half year. I have not used this card till today but I am getting bill of the same and the amount is about Rs.2000/-. I want assistance for cancellation of the credit card without paying the fees as I have not used this card.