If they're willing to break the law to run a scam and steal your money, why do you expect them to obey a law saying not to call us? They break laws, that's what criminals do.
Both my home phone and cell phone numbers are on the do not call list, but I get unknown calls quite frequently. I don't answer, but I agree with your sentiment -- a lot of good that does.
My husband and I are both on the no-call list also and we get spam calls on a daily basis. I am going to research it and find out what if anything we can do to stop it. Keep you updated.