unfair treatment

i sold my vehicle with the tracking device in the car and now i need the device removed and installed into my new car. I sold my car 5 months ago but i am still paying for it. the new owner has also installed a tracking device from the same company into my old vehicle. I am now requesting car track to contact the person and make arrangements to remove it and install the tracker into my new car and they are refusing to do so. they are requesting me to contact the new owner but i do not know them or have the contacts but car track does .all i know is where the car is as i can track it on my app. i think this is unfair because they want me to pay the cancellation fee or they want me to pay the 870 re-installation and R600 if they do not find the car. kindly assist