Unhappy ex-customer

My panic button was faulty, they disconnected it and promised to send a technician to fix it. They still billed me during the period it was disconnected. Eventually sent the technician who broke my cluster clips and mileage reset button. He admitted to his faults but Cartrak took forever to attend to the problem. I stopped paying them, sold the vehicle and only then started to enquire about the payments regardless of my queries. They insisted that I buy myself out of the contract that they themselves broke.