Bad Experience with Cartracker

I had a bad experience with cartracker. In 2022, I was trading in my car. I contacted them to inform them that I will no longer need the tracking device service as I am in the process of trading in the car. We did all the paperwork for early termination of the contract, to my surprise during month end I was debited twice the monthly payment together we the cancellation fee. I tried to resolve the matter with them without no lucky until I went to the bank to block them from debiting my account.