I also didn't answer. They left an automated message saying "Please contact our department at 415-209-5138". It did NOT say what company they were, and upon calling this number back it will not go through! I put it in my cell's contacts under 'nuisance callers'(& all #'s under this contact I set up to automatically blacklist. There may be better ways, just thought I'd share what's worked for me, since obviously this "do not call list" does not.