Cartrack cancellation Policy

I am so appalled at the way this company wants to make money of you we cancelling the service. I sold my car and wanted to cancel the service and the person said it would be R1342.75. 8 months later this ampunt is all of a sudden R1700.00. How can something like this increase if its closer to the end of the 3yr contract. And they dont even discuss the option of removing and placing device in new car after Installing the tracker in the car. They coveniently leave this out! I will never support a company like this EVER AGAIN.