This number has called my home number at least a dozen times over the past month. Never leaves a message.

They called my home phone and did not leave a message on my answering machine. I'll never ever call them back and I'm going to immediately enter the complete number into my new (CPR Call Blocker) V202 which means it's version 2.  It works great because once I enter the number into the unit it will display the word Successful and from then on out if they call me again my phone will only ring 1 time and it will terminate the call. If you make a mistake entering the number you can easily remove it or any other numbers you've entered into it before.