Angry Client

I bought a Toyota Avanza in February 2020 and it came with an existing car tracking system, and then in November 2019 i decided to sell the car, with that i tried to cancel the tracking contract but i was told i couldn't since i had signed a 3 year contract with them, i feel that im being ****** because i find myself paying for a service i do not need since the car has been sold. The worst part of it is that when ever i call them they give me a run around. I don't know what to do anymore.. My phone number is ***