Unprofessional and bad service

I trusted Cartrack with my 2 cars and I shouldn’t have trusted them with my cars and the R150 000 that the promising us when the car is not recovered. I took a tracker with Cartrack in 2020 and in April 2023 I called them to check whether my units are working or not and the person I spoke to told me that both my units are not working so they will arrange the technician to come out to fix my units and I was never contacted. So yesterday 20 June 2023 I called them to cancel both the units and the lady that I spoke to said she will cancel it. Today 21 June 2023 the sales guys called me and they want to sign a 2 year contract with them and I told them I cancelled yesterday and they are saying it’s not appearing on their system that I asked for cancellation. Can Cartrack cancel my units with immediate effect because I have already taken another tracker of which it’s active in 1 of my car. If they failed on this 2 issues 1. Arranging with the technician to come fix the units 2. Cancelling my units

Why should I trust them that if anything happens to any of my cars, they will give me that R150 000 if the car is not recovered.