Tracker cancellation is impossible.

I sold my vehicle in April 2022 and cancelled the Tracker subscription. This is after the contract expired. I have an e-mail to proof that I cancelled the account. Tracker refuses to stop billing me. I already own them R750, accrued after cancellation. Calls and e-mails do not help, they want a debt collection agency to collect the money from me. I did receive a call from an agent that could not take NO for an answer when I did not want to continue doing business with them. I would not recommend doing business with Tracker, at all.