Tracker the ******* business. Charged for not providing a service

I bought a vehicle in May 2014 and had tracker installed as per outsurance requirements. In February 2020 i recieved an email from tracker that upon testing they where not recieving a response from my vehicle. I must contact them on ***. I have failed to contact trackers busy call centre to date. If my vehicle gets ****** they will inform the insurance company that they informed me in writing that my tracking unit was disfunctional and i failed to contact them. Therefore i will lose my insurance payment as tracker was disfunctional. As i tried calling numerous times and was on hold for endless period of time i decided to fit another tracking device from a different company. I now wish to cancel my tracker subscription. Guess what i can not for the life of me contact tracker. Their call centre is too busy. Don't use tracker. They send you an email to say they not recieving a response from the unit but they happy to debit you for nothing. Tracker is just a ******* business.