Ilegal contract signed on my name and charged me pay for after a year from cartracker

Hello hello Peter I hope you guys can help me in this matter a year ago I had a deal with Cartrack on the contract on the basic contract which is month to month want to pay your account your car get covered once you don't pay your accounts you are not covered a year after I came to realise that they've been charging me and trying to debit in my account and when I went to them to see if they can cancel that contribute as I have sold the car 3 months after they install the tracking device on the car and they refused to cancel the contract apparently I had a contract with them which are demanded the contract the printed out for me and the contract was printed and signed by someone else which I do not know who's that person is different signatures I have they have asked me to go to the police station and make an affidavit testifying that the signature that is on the contract was false and will not my signature I prove and show them my real signature and they deny that they say according to them it's a contract has been signed and it is a valid contract please can you help me in this regard contact me on my mobile number ********** for more details and for more scanning contract thank you