Bad service

The after service is pathetic. I had a tracker on my vehicle of which I sold I called them to move it to my new vehicle and same day it was done. I then receive a invoice that I need to pay for cancelation R950 and am since trying to get hold of them eventually got thru to the accounts department was told need to speak to customer care was holding for 45min I have emailed them called them for past 2 days no reply