My family recieve hundreds and hundreds of telemarketing calls every year (typically 2-3 right during dinner). In order to avoid this, I suggested to my family that we sign up for a national do not call list. Debating that this would be a company which leaked our phone number out to the world, I thoroughly read the privacy policy, and found no such scam. On top of that, the site has a suffix of .gov. After about 15 days, the calls started getting rarer and rarer. Now, after almost a month, we recieve almost no calls at all.
I'm so happy we dont have to put up with those EVIL people.
https://www.donotcall.gov/default.aspx