I am on a do-not-call list.  However, these scam callers don't pay any attention to those.  Whenever an unknown number or "withheld" appears on caller i.d., I let it go to voice mail.  On Friday 2016-09-02 9:09 a.m. I received an incoming call from 646-586-9859, and again at 1:49 p.m. from “Withheld,” an unidentified caller.  Robocaller left a voice message both times, “With legal matter and send this case to the local county court house.  Kindly call us back con our number 646-568-9859, I repeat it 646-568-9859.  Thank you and goodbye.”  Obviously a scammer trying to find some gullible people.  Don't call them back, they're not legit.

Two to three calls came on my mother's phone with the id of "Withheld". I answered, and asked, "Who is this?" The person on the other end said the same thing, so I just hung up. They didn't leave a message.