Scammers like these do not comply with the Do Not Call Registry. Regardless of your political views, these calls have been going on well over 13 years as the Do-Not-Call Implementation Act was signed into law by President George W. Bush in 2003.
Did you know with your Panasonic phone you can probably block with as little as two digits? Check your owners manual under blocking-range of numbers. With mine, if I block say 64, it will block all numbers starting with 64 (640, 641, 642, 643 and so on). By using that method I have blocked 96% (I did not block a couple area codes-family and friends) of all possible (actual and fictitious) area codes and still have plenty of available blocking spots.