Well, I'm sure that's true - most folks would be less willing to argue with them, but I for one would be more willing to hang up on them. LOL
I'm calling the phone company tomorrow to block numbers that come up as "unknown name/number", meaning they've got caller ID blocked. It will cost me a little extra every month, but it's worth it not to have to screen those calls. If it comes up "unknown name/number" right now, I just ignore it, and 9 times out of 10, they don't even leave a message - so I can only assume it's an autodialer from a telemarketing company.