credit card fraud-Every indian help needed on this issue...pls help me.

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i have just got a bill from a courier boy when i opened that bill i was surprised i got bill from bank which claim to due on me around 8000 RS eventhough i didnt have anything from this bank...as per bill i have got a credit card from their bank and i have done some purchasing througt that card but as far as my knowlegde is concern i never have any kind of relationsheep withthis bank i dont know who have taken card on my behalf and how i can handle this issue . pls guide me how to sort out this problem.