Mix telematics faulty installation

I bought a new car in January 2023 , received a call from Mix telematics (Marketing) call center and I agreed for the installation of Matrix and Beamie systems . Two guys arrived and told me that they don't know how to do the installation but they will get somebody that will know how to do the installation. Two days later a guy came and did the installation. I phoned the call centre to ask for a remote . A day later the car gave a warning that the installed system interferes with the antitheft funtionality of the car. Called the call center twice over a period of 2 weeks. No remote, no response. Went to Roodepoort installation center to have the system removed. They refered me to the Krugersdorp installation center. A very helpful lady immediately sent an email to the "complaints dept " to report a faulty installation. I was advised that a technician will make an appointment with the local MB dealer and they will then jointly try to sort out the problem at the cost of Mix telematics It is now 11 MONTHS later, no remote , no response . JG Smith