Netstar Poor service

I recently bought a new car and signed a contract with Netstar. They fitted the tracking device at the dealership.

But ever since I took the car Ive been getting endless erro messages sent to me via sms. When I called the nunber they promised to send through a technician.

Technician came through looked around but wasnt able to fix anything, said they would contact me to get a different technician to fix the problem.

I had to calm Netstar again to report this again, where they once again sent the same technician who still was not able to fix the problem. He promised I would get a call from the installers, this was 2 days ago. Still nothing.