Disgusting customer service for faulty unit

I would like to share my experience with this company called Cartrack. I had noticed on my cartrack app that my device installed in my vehicle was not updating. I then proceeded to call the call centre to test the unit and they had advised that the unit is faulty. They then logged a call to get technicians to have a look/repair the unit. This was logged on 19 September 2021. After a few weeks there had been no contact from cartrack. I tried numerous times to call them but could not get through to the scheduling department, each time I was asked for my details and advised that someone will contact me after many failed attempts at getting a call back I then decided to follow up with an email on 13 October 2021- to which miraculously the following morning I received a call from the scheduling department and they had advised that they could come out to repair the unit the same day as they had a cancelation. I agreed and they advised the technician will call an hour before he arrives to make arrangements to meet. I get an sms stating that at 11h50am on the 13 October 2021 the technician will arrive. I get a call at about 10 am before the agreed time from a technician from Cartrack who advised that he has arrived at the premises to fix the faulty unit. Unfortunately at this time the vehicle was still dropping off clients to which the technician advised that the call centre will call again to reschedule the appointment. At 11h50am we then called the technician and he advised that the call was removed from his load and that the call centre will contact us. Till this day 26th October 2021 I have had no response to my emails, no call from Car Track , no contact unyet they keep deducting money for their faulty unit that is not working or functional. Their customer service is disgusting to say the least. My insurance cover is conditional in that my tracker should always be in working order. I have advised CArtrack that should anything happen to my vehicle during this time I will hold them responsible despite any T&C's, as I feel I have given them more than enough time despite covid conditions to deal with the issue at hand. I would rather much deal with other car tracking companies but I refuse to pay cancelation fees for their poor customer service.