Unauthirised debit order

cartrack is refusing to cancel my contract since last year in May 2022 till now i have explained to them that im selling my car and they have refused to cancel the contract i always reverse the premiums and they change references to debit my account i requested a recording whereby they confirmed that i cannot cancel my contact the consultant was speaking so fast hence i didnt even hear that clause kindly assist because they are ****** how can i pay for something that i cant even use