Question was are BT worst company. Absolutely not. By far and away the worst set up for customer service etc has to be Scottish Power. They have been propping up the customer service satisfaction surveys for yonks. From personal and other family members experience they are simply the pits. I would of course give the details but I'd have to have the day off work to detail them. My suggestion though for any bad service situations - get the Chief Executives email address and mail them . This site is brilliant to track them down:
http://www.ceoemail.com/
I've used it with BT and boy did that get things moving, CEO's do not like direct customer contact and they get off their butts pretty quick when they get one. Scottish Power are in a different league though as they simply ignore them. However I found that repeatedly bombarding the entire Board of Directors did get a result. I was paid some £300 in compensation through their sheer and utter incompetance.
Moral - go straight to the top if you don't get satisfaction