Bad non customer service

I am beyond upset as Joshua Door continue to harass me and threaten me with legal action while I am not even a client of theirs .I have received several text messages with regards to this and I have responded to them notifying that they need to check their facts upon which they rep**** that they will have a look into this ,Low and behold ,the text messages started again threatening to send the sheriff to my house .I want a manager to contact me with an apology as i will take it further