No service from Mix Telematics Africa

I have requested Matrix to downgrade from a full Matrix service to a Beame contract in my Land Cruiser. I had phoned numerous times and sent an email, but with no joy. Nobody is coming back to me to make the necessary arrangements to remove old tracker unit & install new one as explained to me. It seams if you request for a new installation like the Beame on my Etios recently, they are quick to comply & install but if you want to downgrade, they are missing in action. Complaining at Hellopeter are my last resort but I am gatvol of wasting my time with phone calls & emails and receiving no service