You do not have to re-sign up every year for the DNC. That became permanent before the first year was over with. You alsompostedtoapost9ver 2 years old and its highly doubtful you will get a reply since this forum doesn't send out notifications.Scammers use spoofed numbers as well, you would not be able to track these down as it takes many subpoenas for this kind of thing and even then, government agency's run into walls.
Do a search on call blocking devices and phones.If its a cell phone, there are free call blocking apps out there including trac & straight talk.
http://800notes.com/forum/ta-5d4e343675a5629/call-blocking-devices
Got a call from this number. Man was very mysterious and harassing. Would not spell the name of the company he mumbled he was with and wanted my personal information. Threatened me.
mysterious, unprofessional-sounding caller avoided all questions. He has called several times before when I wasn't home to answer. No message left. He knew my name and asked me to confirm my birthdate (which he also knew) in order to "protect Molly." I said , "Molly is going to protect herself right now by hanging up the phone."