Folks, I get these calls and HATE them.  After my Panasonic wireless phone call blocker filled up, I found something you may be interested in.  NOTE:  This is not my product, and I only speak of it because it works so well.  Look up "Pro Blocker Pro", model CT-CID803.  Once you figure out how to use it (the Chinese-English instructions are funny, but not helpful).  You see them everywhere for about $39, but I found mine here: http://www.tomtop.com/search/call-blocker.html for about $18 . . . and if you are a "hellovashopper" like me, you can probably find it for less.  Look into it.  This gizmo has earned it's place in my home.