ADT is trying to ****** money from me.

I have never signed any agreement with ADT, I had previously had a contract with National Security and Fire which I canceled months ago. Someone from ADT call me to inform me that they had taken over my contract with National Security and Fire, I told that I do not have a contract with them as it was already canceled. No I see they have updated on my credit profile that I have a revolving contract with them that is outstanding. This is very disappointing and concerning as I do not have a contract with either one of these companies. They are just trying to ****** money from my account.