Cartracker is bulling me

Good Morning. I was a cartracker client 3 years ago, I have contacted cartracker to come and install a tracker in my car 2018 in a 3 year contract. After 3 years cartracker still want me to continue with their services and i told them that i am nolonger having a contract with you please remove me from your system, they dont want to remove me, they say i am into month to month contract now. And i told them that i dont know anything about month to month contract please cancel it. So now they are busy sending blacklisting massages of a contract I don't know. Cartracker is bulling me, I would like cartracker to stop abusing me and stop this month to month contract i didn't sign up for.