No response from bank! Not happy

<p>I have recently received a fnb credit card and have noticed a credit card transaction late in december 2016 that was unauthorized by me. I have mailed the bank a transaction dispute form, yet I havent received a response from the bank. I have e-mailed the form again and hope to receive a response very soon. I am a new credit card client of the bank and I am honestly thinking of cancelling my card should this matter not be resolved quickly. I am charged interest for a ******* transaction thats been billed to me from a company I don't even know. Can this situation be resolved with satisfaction and be avoided in the future? Can this company be blocked from future transactions?</p>