2 Cartrack systems with endless issues

I had 2 new Cartrack systems fitted in my vehicles. Since July 2015 I had endless issues. Saturday 5th March I pressed the panic button on my vehicle and no one called back. For the 3rd time since the system was put in we had to have it replaced. I had the same problem with my other vehicle on Tuesday 7 March. 10th March a new system was fitted in for the 3rd time!!! I pressed the panic button at 13h55 & 18h45 NO ONE CALLED ME BACK!!! This has been going on for over a year!! I want my money back for all the months as you do not provide the service I paid for!! In 2015 I spoke to Michelle van Rensburg I left numerous messages and she hasn't called me back. I want this system out of my vehicles and I want my full refund. DO NOT tell me that the control room gets a signal cos if they did why the hell are they not calling to see if I've been hijacked?!! The early warning system does not work. The battery was flat yet you never called to check if everything was ok!! For these reasons I want to be refunded.