Get on the Do-Not-Call List
I just tried to get on the site to sign up for not getting anymore stupid telemarketing jackasses calling all the time but there must be a huge rush to get there because it wouldn't come up for me. But here's the link, get on it as soon as you can and finally have dinner in peace!
Do Not Call Site or check the current stats at the FTC.gov Do Not Call site.

[Update: Many attempts to get to this site have now failed and I think I may just end up waiting until late at night when all the good peoples are sleeping.]