I read once that you can track where these come from (if by mail) by using different spelling or middle initials on the forms. I bought some Time/Life books many many years ago that had my name misspelled. For many years I received offers from various companies with that same misspelled name. They must have made plenty selling my name to all those lists. I suppose you could do this by phone also by using a bogus first name. But my solution is like so many of the others, just don't answer unfamiliar numbers. I figure if it's from someone whose number I don't recognize or if it's really important they'll leave a message.