I want to add that I, too, am on the DNC list. I have an unpublished phone number. I have asked these people, then DEMANDED, that they remove me from their list. I still get their calls.
I have Cox as my land line phone provider [which is the phone these scam artists call]. I have just found out how to block their calls, so if you have Cox, you might try this.
Buy a 'Panasonic' Model # KX-TGE210 this is the phone I have I bought it almost 2 years ago. This phone will block 250 calls. They call, you block, just as simple as that !
Or buy any phone that blocks also go to EBAY and look up phone blockers and you can find one that you hook up to your phone line and it can block up to 1000 or more ? unwanted calls. I am on every list to NOT CALL ME but I still get these dumb calls. So it's on you to buy the phone to STOP them.