Bill when car was sold 2019. Billed for 5 years

I sold my car in March 2020 and called car track to cancel my device that was on a month to month contact. 1 i got sms alerts after car was sold for 2 weeks. When i called them they said that i must give 30 days notice till end of April. Its exactly 4 years later and you have continued billing me. 1.I cannot pay for something i dont have. 2. You were notified of the cancellation of contract. 3. I am not paying for the incompetency of you staff! 4. Everytime they called me they say they will listen to calls and get back to me, nothing ever comes from it! 5. Provide me with detailed report up to date so i can see where the new owner drives around because wow .. what do u want me to say ????? 6. You get Nimble to call me and harrass me and threaten me. My contract is with Car track. If car track sold the debt that has got nothing to do with me because just like how they ****med me, They ****med Nimble selling debt that does not exist. Now please leave me alone .. If u want lets go settle this in court