Faulty device

I have a Matrix device that was installed late last year and has been malfunctioning ever since. I contacted MiX Telematics several times to complain about this issue. Eventually in December I was told that al technicians were on leave and somebody was going to come and check it on the morning of Jan 11th. We waited and nobody pitched without any explanation. <br> I phoned again as the thing continued to report a location that is sometimes more than 200km from where the vehicle is at a point in time. I was given reference number ***9 and told that Sizakele was going to phone me the same day. It is now three weeks later and she has not phoned and nobody has updated me on the progress of this call. I now feel very uncomfortable to have a company with such a bad track record when it comes to customer care to secure my vehicle. We cannot go on this way and think this contract must be terminated if I can't get what I was promised.