Poor service

I've signed the contract, got the tracking device installed and it did not work from day 1. I then contacted the call centre, who told me to just keep on driving, the unit will start working. It did not. I tried to contact them telephonically and gave up after holding numerous times for more than 5 minutes. I the sent a email to the clientservice email address to request removal and cancelation of the service. I haven't heard back from the again.