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 - they hold up to 1500 and can do whole area codes..  You can google them and many are around $60.00 or so.

Report your callers here:

https://www.ftccomplaintassistant.gov/#&panel1-1
https://esupport.fcc.gov/ccmsforms/form1088.action
https://complaints.donotcall.gov/complaint/complaintcheck.aspx?panel=2

http://www.stopfraud.gov/report.html
http://www.fraud.org/