Syncup tracker won't update

I have had the same issue since day one on November 7th. I got the 3 tracker and home internet bundle. Two of the trackers have worked perfectly but the 3rd has never worked. I'm not on the 3rd replacement and it doesn't work. I've been been the store and on tech support so many times I lost count. I refused to buy a new one or add another line. I feel like there is something wrong with the phone number assigned to it but no one listens to me. I need this to put in my wife's car as it has been stolen once already. This 18 year customer is very unhappy.