No they don't. That only works in small business. In big business (limited vendors), you simply get your choice of which type of crappy service you'll have inflicted on you. Or does your choice of phone company offer human beings who answer your calls and offer prompt, expert, and courteous service.
The last time I checked, there were a couple hundred phone comapnies to choose from, with only a handful being big (remember all the "slamming" that was being done by those many small companies). And don't forget cable companies, VOIP, phone cards, etc. Of course, thanks to FCC deregulation it's pretty easy to start a new company. (Well, as easy as it is to start any new company.) It's interesting that most people put cost way above service and other factors, so perhaps there isn't as much demand for service, as a whole, as you'd like to motivate such a service focused company. --Mark