Do you expect a thief to stop robbing people because there's a law against it?
These callers are ciminal scam artists who have no reason to respect laws in this country, as they are based overseas, not to mention, again, that they are criminals.
The Do Not Call list is worth a LOT, it's too bad you don't recognize that. You just don't understand the world of modern-day telephone scams.
Take the time to read the following and you'll learn something.
From the FTC web site regarding the Do Not Call Registry:
"My number is on the Registry, so why am I still getting illegal calls?
Since 2009, the FTC has seen a significant increase in the number of illegal sales calls – particularly robocalls. The reason is technology. Internet powered phone systems make it cheap and easy for scammers to make illegal calls from anywhere in the world, and to display fake caller ID information, which helps them hide from law enforcement.
What is the FTC doing to stop these calls?
To date, the FTC has sued hundreds of companies and individuals who were responsible for placing unwanted calls, and has obtained over a billion dollars in judgments against violators.
In addition, the FTC is leading several initiatives to develop a technology-based solution. The FTC has sponsored a series of robocall contests challenging the tech savvy public to design tools that block robocalls and help investigators track down and stop robocallers. The FTC also is encouraging industry efforts to combat caller ID spoofing.
What can I do to stop unwanted calls?
Make sure your number is on the Do Not Call Registry.
Hang up on illegal sales calls. If your number is on the Registry, and you get a sales call, or you get an illegal robocall, don’t interact in any way. Don’t press buttons to be taken off the call list or to talk to a live person. Doing so will probably lead to more unwanted calls. Instead, hang up and file a complaint with the FTC.