The do not call list is only as good as the volunteer servant handling it and the little old lady writing the letter. If they are not just using a city directory which has no information.
I get loan offers, house offers, new church in the area, charity all the time. Easily thrown away.
Wait until they resume door knocking, then it will be worse. I know, I was territory servant once and got yelled at for not having the secret elders (I wasnt) directions on the do not calls. Funniest part was after a hostile person made a scene they sent 2 elders back to apologize. One a pushy type, the other too dim to catch on to body language