Tracker device instalation left my vehicle dead.

I booked my car to have a car tracking device installed by Tracker in Bellville, Cape town. This was done on the 25th November 2020 at Glassfit in Bellville. I waited +2 hours without any feedback from the guys that where working on the vehicle, when I finally asked what was happening I was told that it was going to be done in the next 15 minutes. 30 minutes passed I went to the guys to find out what was going on, I was told that they couldn't start the vehicle. This is a brand new vehicle "Mazda 3 hatchback 2020" which I had collected on the 19 November 2020 from Mazda Somerset West. I drove the vehicle to get the device installed after tracker worked on the vehicle it did not work. The car had to be towed from Glassfit to Mazda as Tracker denied having done anything to the vehicle. They also left without having fixed my car. I was left with a vehicle that could not start up and had to figure out what to do with the vehicle. I am so disappointed and angry with the way tracker handle the situation. The car was booked in at 10:30 at 4:00 I was still at Glassfit with a vehicle who's ignition wouldn't go on and the people who had worked on it where no where to be found.