Assuming everyone here has registered their phone number with the National Do Not Call Registry, don't forget to file a complaint with the NDNCR.
It is informative to read everyone else's problems with these phone "trolls" here, but we MUST do something with more clout by turning them into the National Do NOT Call Registry - which was originated for just this problem!
Go to: https://complaints.donotcall.gov/complaint/complaintcheck.aspx