Do not install Car track's tracker in your car, you will pay until you die

I had cartrack installed a tracker in my car, so I had 24 month contract which turned 36 months according to them, anyway I called to cancel I paid the cancelation fee at the time in 2018. It was quiet I did not hear from them until the beginning of the year 2020 which I was told I owed them money which it was at the time R2200, I explained what happened to the person who called she checked and confirmed my story. It was only week then I had to explain myself again to another call center agent which I told her to go through the previous recordings to save her time and mine. This is the game they have been playing until to date, they call at least 5 to 10 times a day including week ends and apparently I owe them now almost R4000. I don't even think they do keep the voice recordings or they do record at all. The contract was cancelled in 2018.