Put the blame where it really lay's, with the criminals and illegal telemarketers.
The DNC works just fine. It is for telemarketers only and honest business does indeed abide by it. It is the criminals (which includes illegal telemarketers), frauds and scammers that do not. However, the Fed. DNC does not cover some survey's, Political or Charities. You would need to check your states DNC laws to see if these are under your states DNC laws. The fact remains that they are not automatic call blockers though and can not protect you from the calls that are criminal, illegal or fraudulent.
Do consider maybe getting a call blocking device or phone.. You can google them and many are around $60.00 or so.
SCAM originating from Detroit, MI. Caller nevers leaves a message; Return call yield no information about caller or what they want. Other numbers connected with this number from Detroit: 313-355-5260, 313-355-5263
Called earlier today and let the answering machine pickup (since I don't know any one from Detroit). As usual it rang 3 times and left no message. I figure if it was legit, the name of the person/business/organization would show up on caller ID instead of origin of call or any other bogus info. that shows up on it. Besides if it was truly important, they would've left a message.