Tracker after service

Good day, I have been with Tracker since 2016, and over the last 6-8 months all my vehicle devices were not working as they should. Every time I drove a vehicle, I would receive a call and notify them that the device wasn't working. I then get told it has been logged and this happened every time. Eventually, someone was sent out. A new device was fitted and thereafter I drove the vehicle the same afternoon and had a steering light error, which technically deactivated the power steering making it difficult to drive. I have sent emails and was told that I need to pay a call-out fee to check the vehicle, I then rep**** to cancel my plan. A sales agent called and offered me a free month, which is something I did not want as I needed my vehicle in the condition it was before the new device was fitted. My original mail to bring up this issue was sent on the 7th of October, I was contacted Friday, and to date no further contact on when a technician will be available to check. This vehicle cannot be driven it the condition which its in and I need to use the vehicle, yet the after-service and customer care from Tracker does not seem to understand this. I will be canceling my policy and will not entertain any early cancelation charges for services that I cannot access. I am currently looking for alternative tracking solutions, I would stay clear from Tracker.