Got two from them in 5 minutes, rang once and quit, leaving the number on caller ID. DNC list is just short of worthless. And so is the government as regards doing anything.
Suggestion to anyone interested: I switched from ATT to a VOIP provider whose plan includes a "black list" capability up to 99 individual numbers. All of my in & out calls show up in my online account within seconds. I simply copy / paste the number into that list, with a note as to their identity if I know it, and I never hear from that number again. They receive a message "This number is not available" when they call.
Great thing is that I also use it for those callers that are exempt from regulations. Works wonders.