Unacceptable Service and product from Cartrack

I am very disappointed with the service from Cartrack, i installed one of their units when i bought a new car and it has not been working from day one. They have this "awesome" app with a map where you can see at which location your car is and this never worked for me i got in touch with them to help me get the location/GPS fixed then they told me the unit is faulty after two months of having it installed in my car, eventually, after numerous phone calls they came out to "fix" the unit. A day after they fixed it i had the same issue where the app doesn't show the correct location, now i get phoned every second day to be told they detected a power loss on the unit, after their investigation they told me the unit is faulty again, now i am waiting another 3 weeks for them to come out and fix it. So my question would be what if my car gets ****** and they cannot retrieve it? will my insurance payout if they see that the unit was faulty all this time?

I will be cancelling my service and moving to another company