According to the National Do Not Call web page https://www.donotcall.gov/
"Your registration will not expire. Telephone numbers placed on the National Do Not Call Registry will remain on it permanently due to the Do-Not-Call Improvement Act of 2007, which became law in February 2008. Read more about it at http://www.ftc.gov/opa/2008/04/dncfyi.shtm."
I just finished filing a complint on Govt Do Not Call List site. If everyone receiving these calls would do the same, they might get off their buts and fine these people $10,000 per violation of the Do Not Call Law.
Someone called from 469-250-0270 to my cell phone. When I don't recognize a number I answer as if I am a business. They hung up and when I called that number back there is a recording saying the number I dialed has been changed, disconnected or no longer in service. How ridiculous is that and how can that be since it shows as the number called from?