Have you ever had one of these guys turn up at your door trying to get you to change your phone line from Telekom to Arcor?
I had one at my door the other day and I couldn't believe how aggressive he was:
Me: [opens door]
Him: [doesn't introduce himself] blah blah blah change your phone to Arcor blah blah blah, show me your last phone bill.
Me: Er, what?
Him: I need to see your last phone bill.
Me: No thanks. I don't want to switch to Arcor.
Him: But I need to see your phone bill, then I can tell you if you'll save money.
Me: But I don't want to switch to Arcor.
Him: But look [shows me an example phone bill], you can save money...
Me: I don't want to switch to Arcor.
Him: But you need to show me your last phone bill.
Me: Goodbye.
Me: [Tries to close door, but can't because he has his foot in it]
Me: Goodbye!
Him: [Removes foot] OK, if you say so.
Unbelievable. After that episode I wouldn't buy from Arcor even if I had previously intended to.
(Normally I wouldn't bother answering the door, but it was the actual apartment door rather than the building main door, and I was expecting someone anyway.)