I believe no discussion of poor customer service is complete without the inclusion of PayPal.
Just yesterday I attempted to close a business account and was presented with the message "We're sorry, but your account cannot be closed at this time."
No explanation, no nothing.
So I called the 1-800 number, and after waiting on hold for more than ten minutes was told my account would be closed right then. Okay, but still being naturally curious as to why I couldn't close my account through the site, I was told that there was no reason, I just couldn't do it. That's literally what they said.
So it would seem that they just want you to jump through an unnecessary hoop to make the funnel out of their site as narrow as possible.