Car problems after installation

Worst customer service I have ever experienced. My insurance requested install a tracker in my vehicle and suggested I should use Tracker. I made the booking on-line and immediately the debit order notification came through, although I have not even received confirmation on when they will come and do the installation. The installation was booked for a morning first thing. After the installation was complete, I had to go to the office. A block from my house the car have a lights malfunction warming message with the lights and the indicators not working. I phoned Tracker to inform them and they said they will arrange for the quality assurance person to come check. Nothing happend, phoned a few times after that nothing happened. I then stopped the debit order. I got called again, I explained my story again and said I must hold, for 10 minutes I was on hold. Unfortunately, I also need to work, and I dropped the call, they called me again while I was in a meeting that same day, but never after that again. Again, because of the debit order, they called again, and again I was told they will call me back the following day, no one called. Now after almost 3 months and numerous calls I called them back to arrange cancelation and the removal of the tracker unit. Now they want to arrange assurance check again. Who are these people, do they have any pride in their work/service? I have to endure every day with the malfunction problem. The best of all it they want to charge me now to remove it.