The same company has been harassing for the better part a year now wanting to buy a property I don’t own. I have filled a DO NOT CALL registration, I have blocked their numbers multiple times, I have told them to stop calling and to remove my name from their list, and now I’m getting maybe 1 or 2 calls a day and multiple texts.
This was happening to me (although maybe not at that frequency). I ended up googling the property they kept asking about and found some site (clustrmaps.com) that had incorrectly associated my contact info with the property. I wrote to the company from a contact us page on their site and requested they correct the data removing my name and phone number from the property. They wrote back apologizing for the error and confirming that they had removed my info.
Have you tried searching for that property online? I wonder if you might have a similar problem where they could remove your info from that property.