Cartrack, issue not solved, years going on

Cartrack is a really bad service provider, I canceled my contract with them March 2019 but obviously they didn't cancel it so November 2020 I got contacted again by them telling me I've got an arrears and it was R630 so I went and paid it and was told it's canceled and account is closed. Funny story it wasn't closed. I still get phoned and harassed till today. I have a paid up letter and all and proof of my payment and emails supporting this. Also they had my car registration all wrong on my account and phoned me and smsed me not even for my car and yet I paid them after they made the mistake, I've tried yet again today to speak to their accounts department. Waited for over 10 minutes to be helped and placed to 3 people then I got placed on hold and they dropped the call, I'm so sick of Cartrack and their people and yet according to their recording we have to listen to they take pride in their customer service service, it's a complete joke,