Faulty unit, empty promises.

second time in a row my unit is not operating. I noticed a few weeks ago that my unit is not updating on the skytrack. But as I was about to make a call I got an sms that informed of the same and it prompted me to send yes if my car is in use, I did indicate that my car was in use, which meant that the unit in my car not working...I received no call or any more communication. Then I got a call from your call centre informing me of the same. I then confirmed that the unit is not updating. I was promised that I will be called to arrange an appointment, until today. I have two questions: If my car gets ****** are you going to pay me for it? and why have you been charging me for a unit that is not working?