My unit is faulty since December

I joined the company last year December, and everything was fine for that 2 weeks. I had an incident were I pressed my panic button no call no nothing even sms. And again I was nearly got hijacked because I press the panic but may time nothing happened .I had to drive to the nearest garage. So when I call cartrack that why I my paying for the unit that is not working. I was promised that they will send a technician to do the repairs till today am still waiting. I just feel that am not valued as a client only 3 months but I just want my money back . The service is very bad .

And no one is taking counterbility , and they good in promising and not fullfil their promise. And if anything happens to my car someone will have to take counterbility.