What is truly irritating about this place is that even if you block 1 phone #, they then call under a different one. I have now had to block calls from 3 different numbers of theirs.
Operation Lookout is a non-profit charity, and so can ignore the Do Not Call list. Especially irritating when they look to be spending almost all their contributions on further fundraising. http://www.charitynavigator.org/index.cfm?bay=search.summary&orgid=9190