No means NO

I have to rant for a minute ...

Why can't some people just take "no" for an answer? I mean what is so hard to comprehend from the word "no?" I was thinking about a particular situation I was dealing with a couple days back and it kinda got resurrected today because Joe Schmo (that's what we'll call them) couldn't understand what "no" meant. When people ask the question,

"What part of 'no' don't you understand?"

I really think that there is a logic behind their asking that. Maybe these people don't actually understand what "no" means. Like salespeople or telemarketers...they just have no idea what "no" means. You try to be nice the first time with your "no," but when it doesn't register the first time you say it, you end up unfortunately having to get hasty with them...NO, NO, NO, NO! Geez Louise! I think maybe they've been conditioned or programmed to just not hear the word "no." I think it may go through their brain like this...
THEM: Hello, would you like to buy a "free" magazine subscription?
US: If it's free, then why do I have to buy it?
THEM: Oh, that's just a processing fee you're paying for...
US: How much is the processing fee then?
THEM: $49.95 plus tax...but that's all logistics. What credit card would you like to put that on?
US: Err, ___ thank you, I think I'll pass...
THEM: Oh...you're welcome. We accept Visa, MasterCard & American Express. You can go ahead and give me the 16 digits on your card now
US: Dude, I said ___ thank you!
NOTE: NOTICE THE LINE WHERE THE "NO" IS SUPPOSED TO BE! THAT'S THE PART THAT DOESN'T REGISTER FOR THEM.
THEM: You are very welcome. I'm ready for the card number when you are...
US: ____ THANK YOU! GEEZ!
THEM: I said you're welcome. Ma'am whenever you're ready...
US: ____, ________, ___________!
(CLICK)
That's pretty much how they hear our "no's". They just don't!
What is wrong with people??

Pushy guys, salespeople, telemarketers...NO MEANS NO MEANS NO! There's NO other way around it! NO!!