I'm being debited for an inactive device

I'm currently paying for Cartrack's tracking service, which has not been operational since installation in June. After an initial technician error, a follow-up visit confirmed the fault and advised the vehicle be taken to a workshop — with Cartrack covering the cost. I paid R150 to proceed, and was assured that once the vehicle was booked in, the tracking equipment would be refitted. However, despite this process being completed, the tracker has remained inactive. I’ve called the call center multiple times over the past two months. Each time, I'm forced to always repeat my story, only to be told that my case is being escalated — yet no resolution or feedback follows. I've now had two debit orders processed, paying for a service that has never worked. Cartrack refuses to refund these charges, claiming the device is installed, despite it functioning for less than a day. At this point, I feel completely let down and uncertain of how to proceed.