Terrible customer service.

********** customer service, the worst ever. I'd rather have my vehicle ****** and never recovered than deal with Netstar again. I had a smartbox telematics device installed in my car, I've sold the car last year November and transferred the device into the new owners name, however, Netstar have continued to bill me every month. I have tried numerous times to phone and resolve the situation but I get transferred to a different department every 5 minutes, no one seems to know how to assist. Extremely frustrating. They never seem to have issues starting the debit orders, but it seems impossible to end them.