Cartrack will not cancel my service

Requested to cancel my contract as I was selling my car, then I am told the contract lasts till 2023 and I must pay a cancellation fee. Requested 3 times for my signed contract and was told it would be sent to me, but have not received anything. Then after phoning in and complaining about this lack of service, I am told that there is a voice recording of me agreeing to the terms, needless to say they would not send that to me either. Then after screaming and shouting that I am terminating my contract immediately and there should be no debit order at the end of the month. They still politely just debit me with no notification regarding my cancellation. 2 month later and they still going on as if my phone call never happened. Are the staff there just stupid or do you train them to be useless in order for you to keep taking money without supplying a service?