Very unprofessional shocking service

I have had the worst experience with cartrack. At the end of last year my car with the device broke down and I had to buy a new car> I then contacted Cartrack to put a new tracker in the new car an waited for several months but got no reply from them. I now received a letter that they have handed me over for not paying but I don't even have a tracker in my car!! I then phoned them and explained my situation, they were very helpful over the phone and would have sent me a email which im still waiting for. so yesterday I phoned again but still no cooperation from them. im so disappointed i chose Cartrack very unprofessional!! I will never again recommend them to anyone!