A reader points me to
this Consumerist post on how to get a response from a recalcitrant company; the comments are priceless. As always, the point is not to do this until you've really been abused, not merely when you want something fixed NOW and they can't do it for two days. I mean, if you're talking about a leaking sewerage pipe, fine, but otherwise, it's not unreasonable to expect slight delays and occasional mistakes.
This article available online at:
http://www.theatlantic.com/business/archive/2008/12/consumer-carpet-bombing/4413/