Anyone out there?

I have been trying to cancel my tracking unit service with MiX Telematics for over a week. The car that the unit is located in was sold. Now I am paying for a service I have no use for. I have sent numerous emails, contacted all the numbers possible. Phone calls are not being answered at all and emails remain unread. After trying all the numbers from their website someone in the sales department eventually answered.(Jip, sales are always fast, but after service lack completely). This lady promised to send me documents but I have not received anything yet. Makes one wonder how long it will take to locate your car if it got ******....