Very unhappy...

Iv had a device in my vehicle for more than a year now but traded it in yesterday. I called in today to cancel the tracker but i have been informed the settlement amount is R1200 on my account to cancel my contract. This i was unaware of until now. I was told if i dont settle the amount i have to pay until July 2020. This is for a vehicle that is not even mine anymore. So i asked if we can move the tracker to my new vehicle. I was told yes but then i have to pay over a R1000 aswell. This is unacceptable!!! Absolutely terebile service. If i was told this i would never of used this service.