Car track are *******s

Car track is a complete rip-off. They advertise and sell you a contract at one price and during the duration of the contract increase it every year by 10%. I made a huge mistake by installing Car track on my vehicles just over a year ago. A year later I sold one vehicle and purchased another. In order to have the unit transfered from the sold vehicle to the new one their charge is R870.00 which needs to be paid before they even book it. And via EFT or debt order. No cash. They must then be sent proof of payment. Cancellation cost is R1700.00 They also require you to sign a document stating they will only proceed with booking once you sign the form stating they will only proceed with booking once payment is made. I can understand a fee for transferring of a unit but R870 is ridiculous. A contract also should stay the same for the duration of the contract not increase every year. Something they do not inform you of either. The staff have little to no common sense and expect you to just do as they say without question. They then also proceed to tell you how to feel after upsetting you. The manager claims the fee of R870 is because they putting in a new unit. What's the need of transferring then? Their system is also a problem as I had to take my vehicles in a few times to have the units checked as it was not working. These are complete *******s.