I had a similar problem. I recorded a message for my voice mail answer that went like this: " The number you have reached is for me, John Doe, not Joe Doe. Joe Doe does not live at this number. If you wish to reach Joe Doe this is the wrong number. Please do not call this number if you wish to reach Joe Doe. On the other hand, if you want to leave a message for me, John Doe, please record your message after the beep." I then just let calls from unrecognized numbers go to voice mail. It has drastically cut down on the robocalls I get.