I've received calls from "WINNER" (yeah, right - like anyone is stupid enough to answer using that lame fake Caller ID) off and on. I just unplug the phone and let it ring and ring on their end. Then I plug the phone back in and go about my business. I, too, have a Panasonic that allows you to block up to 30 numbers. Since that can fill up in a week (I get a LOT of these fake BS calls), I won't block them unless they get annoying.
For those of you that also have Panasonic phones and wish to remove older numbers from your call blocking list that don't call anymore (i.e., the scammers already switched to another number), you can view your list of blocked numbers by pressing the soft key below Menu, then pressing #217. You can then scroll up and down the list.
Good thing about callers that hang up on you, you can complaint to the FCC about it without having to determine if they are selling anything! Abandoned calls are illegal!
I was on the computer today watching a video of president obamas inauguration speech and got call from this # 1-360-529-6158 the recording said" The F.B.I. reports there is a home invasion every 12 seconds in The United States ,to prevent your home from being burglarised we will put a sign in your yard if you agree to having the sign you will be eligable for a free security system from the F.B.I." The ony option it gave me was to be put on their no call list didnt say how to get the system ,so i called it back it still only gives me option for a no call list Well not that I do ,but if I did how do I get it? anyone know what this is or why the F.B.I. would be trying to prevent home invasions just doesnt sound like their job sounds more like a legal way to perform illegal wire taps if you want to see for yourself google "free fbi security system"