Political survey that refused to reveal who they are doing the survey for.  The person kept telling me "Nationwide Public Opinion Firm."  I tell them I used to design and administer public surveys I want to know who hired them.  She'd give her name.  "No Sandy you didn't hire the firm, you are administering the questionnaire.  I want to know who employed your firm."  She wouldn't tell me I hung up.

I get these calls too, and never let them talk. I just double punch the phone button so it hangs up right away. Unidentified callers, just like anyone coming to my door wearing a mask or hiding their face, they don't get in, or answered. Except on Halloween, for the "door" part.

i like ur answer about wearing a mask - unlisted numbers

I live in Kenosha and got 2 calls from them, no message left on my machine.  I agree, the Do Not Call list just isn't doing its job.  These calls are so annoying. So much for a peaceful meal .....

If you have Caller ID, use it!  This call ID's as nothing more than Madison, WI, which should be reason enough not to pick up the phone.  If you do pick it up, even if you immediately disconnect you have already shown your number is a "live" number.  In fact, if you've done that a few times before, your number is already on lists sold and distributed as lists of live numbers, so you may have unknowingly screwed yourself.  If you have an answering machine or voice mail, use them!  If it's a call you really need to hear, there should be a legitimate message left.  Resist that urge to pick up the phone if you don't know who it is in advance!