Paying for a service that I'm not getting!

Haven't been able to track my vehicle on my cartrack app for almost a month now. Technician was advised to replace the unit, which was working fine. Numerous calls later, so many different agents promising to sort this query but never get feedback. I was not happy with cartrack from day one and when I emailed to have the device removed before the 7day cooling off period was over, I was advised that I'd have to pay a cancelation fee of R2600+. Appaling.. I'm paying for a service that I not getting and still cannot cancel this contract.