They don't leave a message at all. I have had a difficult time with staying caught up in bills the last few years, so it probably is something that has gone to collections, but I have no mail or message from them. The only reason I know they have tried calling is because I looked it up reverse phone directory online and came to this site. I just think they will never receive whatever money they want because I have nothing that states what money I owe!!!!
They can display any phone number on your caller ID that they want, to trick you into picking up the phone. It is called "spoofing" and it pretty much makes caller ID block useless.