Most horrible service I've experienced

I have experiencedone the most horrible service from Carrick, they installed a faulty tracking devicentre, when I call to to complain they send a technician who never pitched for the appointment, then lie to their head office that my driver never honoured the appointment which infuriated me even more. The sad thing is that I'm unable to change to another company since I'm contracted to an insurance company that forces me to use this company. To this day my vehicle drives around with a faulty device.still not fixed.