HOW I BLOCKED this number: (1) Get a Google Voice number (2) when unwanted call has come in, let it ring until it stops (3) go to Google Voice and login to your account (4) check the box next to their number. (5) click 'More' (below) and select/click on Block caller (6) Click Block. YOU'RE DONE. The next time they try to call, the call will be blocked and your number will be removed from their list. (Before you click 'Block', you can listen to the message their call gets; its the three computer tones and English message, that tells their computer that your number is disconnected and to take it off their list).
Caller: Unknown (electronic call)