OK, the DNC is actually used by honest business.  However, the frauds,scammers, fake charity's and extortionist are not going to and don't obey any law bottom line!  You also need to realize that many of these bad guy's and the shady business's hide behind spoofed numbers and in some cases actually use legitimate numbers pretending to be them just to get you to answer the phone.

Charity's and Politicians are exempt, though you can usually get removed from the honest charity's lists when asked! You also contact the politicians and request them to do not call by either calling their party, or visiting their websites. Also signing up for the Political DNC helps, I generally refer them over to that list as well! Has worked well too.

http://stoppoliticalcalls.org/index.php

The ROT is don't answer calls you don't recognize the numbers for, and never push the numbers they tell you to push to remove you, the only thing you do is verify they have a live number.  Always check the numbers, always file complaints so the agency's have a record of these!  Law enforcement agency's do use those complaints!

I got several calls from this number. I finally answered, herd a mans voice saying "ok cool" to someone, then he asked for me by name....then hung up. Called back....no ring tone....just a "goodbye" in animated voice.

SCAM These are sales people that need to show that they called so many people per day for a salary...