I did not opt in. I figure the private way to handle the problem (and it is a
problem) is to respond: Wait a minute, I'll go get my wallet..." and then go do
something else until I hear the "please hang up" robot of in the domestic
distance. This creates an incentive for that company to take you off its list.
Is deceit fair in return for invasion of privacy? You can also ask the caller
to describe his/her underwear, etc. but then they do hang up and go on to their
next prospect. Better to leave them hanging on the line.