Cartrack dosent track

We have been with Cartrack for just under a month for our 4 vehicles and it has been nothing but a nightmare. They literally have us by the *****. They make you sign a 3 year contract. I have spent almost R500 on phone calls as their system crashes every second day. I have been in contact with them and all they do is say sorry youre upset we will reboot the system, and after the 3rd time of rebooting they'll repair the system. They also refuse to let us speak to a supervisor or manager, so when i called to cancel they want me to pay an exorbitant amount.

how can i get out of this or even get them to give us a system that works?