Faulty Unit

I recently installed a Tracker unit in my car. It recently started showing the wrong information like my it’s stationery while it’s moving or visa versa. I reported that the unit it’s faulty and it’s frustrating. I always get a message that someone will call so they can arrange for technician to come and look at it. I haven’t had anyone calling me. It’s a bit pointless to have the unit because if my car gets ****** Tracker won’t be able to track it.