Car track service it's very poor.

I have an issue with car track, since 2021 I've send them countless emails regarding their faulty tracking device that they've installed in my car, they would send me an email claiming that someone will come to my assistance within 24 hour and no body did. I emailed them that I will not be paying for a service that I don't Even receive, i was successful after stressful years trying to cancel this cause I was paying for a service that I did not receive, I have emails to prove my case finally last month they've issued me with a cancellation letter, I thought finally my nightmare it's over. Guess what they still keeping on deducting money from my account twice a month, the other amount I'm able to reverse it the other amount I can't reverse it. And my bank says they cnt help me reverse debits that's below R1000. I called cartrack but still I'm not getting the assistance that I need. How can I as a consumer pay for something that I dont even benefit from, even after I report to the service provider nothing it's been done. I just want this cartrack headache off my back. Since 2021 I really can't deal anymore, I'm tired.