Poor Service from Mix Telemarics

I have written before about the poor service of Matrix by Mix Telematics. They never have people to answer at Customer Care, but as soon as I post on HelloPeter, I get an immediate response. The Matrix app on my phone no longer works so they encouraged me to use their online platform which I have done. One of my company vehicles has gone to Botswana yesterday and the tracking stopped about an hour from the border post. Since then the vehicle has been to Gabarone, Francistown and is on its way back to Gabarone, but Matrix still shows the vehicle in South Africa. I've tried calling the Customer Care number and that is a useless exercise. I have tried their WhatsApp function but they do not recognise me even though I have 8 vehicles fitted with Matrix MX3 devices. I will never fit another Mix Telematics product to any of my vehicles