Very poor service

Cartrack does not reflect what they preach. My unit hasn't been working since last September. They have been be aware of that, spoken with countless service agents without solid help. Even wrote to cartrack CEO, that either didn't help. I been debited every month. When I ask cancelation, I'm told about cancelation fee. I'm not at fault here, which I don't understand. I had been patient for months, my worry is should something happen to the car. The insurance won't pay up, something that cartrack is aware of . If anyone is reading this can help, please advise.