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.
Assuming USA, sue them. They owe you $500 per call after your number has been on the do-not-call registry for 31 days or after you told them not to call you again. If the violation was willful, they owe $1500 per call.
https://en.wikipedia.org/wiki/Telephone_Consumer_Protection_Act_of_1991
The hardest part of this is generally finding the correct entity to serve.
Next time just tell them you’d love to sell and to meet in person
That doesn’t give you a legal address though.