Unprofessional, do not keep to appointments they make

On the 31 October 2023 a technician was here to "install" a Tracker system on our vehicle. The system was faulty or not installed correctly as we could not access it on our app. After NUMERSOUS phone calls (all at my expense) over a two week period, and a review on HelloPeter, I got an email from Tracker and set up an appointment to re-install the system on 13 Nov at 09:00 (this was confirmed twice by Tracker via sms that was sent to me a day before and the morning of the installation) I waited until 09:40 to contact their call centre, after being put through to numerous people, they informed me that the technician was on sick leave today. They response was that "someone was supposed to contact you". They said I must make time for a technician to come round the afternoon, it they could convince him to work overtime. I explained to the lady on the phone, how I especial had to move my appointments to the afternoon to accommodate them, and now they expected me to move all my appointments again for "if" the technician could come the afternoon. I was then told "please phone us back" once I moved all my appointments etc . Once again they expected me to use my airtime, to re arrange something because they did not keep to their arrangements. All this time my vehicle is not being protected. I am now seeking another company to install a tracking device on my vehicle. Very disappointed in their unprofessionalism.