We got a box called sentry and it essentially blocks ALL robo calls. You'll have to create a whitelist for people that you want to make it through, but our phone hasn't ring in days except for family friends, and the blacklist box rings with caller id so you can see and accept calls from friends. Best thing every. The person calling has to press 0 to come thru, then you can accept. Robo calls cannot press 0 :)
I had already posted in Sept. 2014 about this number calling me. Today they started calling again, ringing about 20 times, just like they did before. I didn't answer.