Car track

They are *****. How can they keep invoicing knowing full well that they can't track your car and not inform you. You contact them and agree to install a traceable system. They install but keep invoicing you incorrectly. Spend so much on calls trying to resolve and emails they don't answer. I have decided to just reverse payments up until I get invoiced correctly. Listening on radio I hear that it's common practise with cartttack.