The Do Not Call List worked for me until Obama was President, then things went haywire in this regard, along with many others.
The problem with the Do Not Call List was that VOIP technology started allowing the calls to be placed cheaply from overseas.
If a telemarketer from Greenville, South Carolina called and you were on the list the government could take some action. If they are calling from India there is really nothing they can do.
I filed a Do Not Call complaint with the PA Attorney General about eight years ago, and they wrote back saying the calls were coming from outside their jurisdiction (Bulgaria!) and there was nothing they could do.
I have been getting calls on my cell phone all week from people with East Indian accents wanting to sell me medications of all kinds. How in the heck did they locate me?
It was the rise of easy access to IP phones with little to no regulation that caused that.
When the scammers were using regular phone lines, we could track them down and actually enforce the law. With IP phones, there is no real trail to follow. You’ll just find some google phone number that was purchased with a fraudulent credit card and used for a week before they moved on to the next one.