[SteveZ]

I simply say, "I'm sorry, but I don't respond to telephonic solicitations, thank you." and the hang up.

The person on the other end is, almost all of the time, a paid employee of a company which specializes in fund-raising. Neither is offended by my comment, and less of both party's time is wasted.

Life's too short to try to educate the person on the other of the phone line, who couldn't care less and probably is paid on commission.....