Spammers

I feel like I'm being harassed.  There's an unknown caller that keeps calling me from (000) 000-0000.  It seems like a prank based off a bad horror film.  I don't appreciate it.  The number's been reported and I've taken my name off of the telemarketers list.  There's nothing else I can do.  Even my carrier cannot block it because it's not a legitimate number.  6th time they've called today, I'm getting a little freaked out.