Disgustin cartrack service

Hi am deeply hurt and dissapointed with Cartrack. They dont even deserve the 1 star rating i just gave them. I am even talking the rest of my family members into cancelling this nonsense and silly excuse for a company. In Feb i sold my car and called in to cancel the service. They told me i need to pay one more installement and only then can i cancel. I did that, and called in “AGAIN” to cancel and they read some contract to me that i agree to cancel the service etc. cool and as i go about my business i keep getting calls from their rude call centre and the people i speak to a devils, no call quality assurance at all in that nonsense call centre. They tell me the service is still active and i owe them. How??? When i cancelled?? This is pathetic. I will never ever in my life go back to cartrack. Trust me guys if u dont want a headache in your life, do not go to cartrack. And their call centre is extremely rude.