Sadly, as has been pointed out before, these calls are from foreign countries - they fake the caller ID so you think they are domestic but they, for the great majority, are not.  Therefore our USA Do Not Contact list is useless.  Our government has no real clout for the most part, those countries don't/won't follow our laws - I mean,  IF they are going to scam you why would they care about breaking the DNC list?

 The DNC list will protect you against legitimate, honest USA based companies who are willing to adhere to it.  Charities, surveys and political calls are exempt too so it really doesn't do much at all.