The Lamentable Loss of Etiquette

The thing that REALLY Annoys me is that people just aren't polite anymore. I work in market research (it at least give me some money) and the most common example of rudeness that happens is thus:

Me: Can I speak to Mr Blah please?

PersonOnTheOtherEnd: No

*sound of phone being slammed down*

I mean seriously, they could at least do me the courtesy of telling me WHY i can't speak to the aforementioned!

Another such example is this:

Me: We're currently carrying out a survey to understand shopping habits.

P.O.T.O.E: F**** Off!

Is there any need?