If you're talking about the wireless meter that doesn't count. Which it seems you are. As far as cable Internet - it is DEDICATED as you don't have to "dial-out" to it (like DSL) With Business Class Internet- you normally do get a business class channel on the Node. So the rep wasn't wrong there. As far as the speed reduction- you probably didn't get provisioned for the speed that you thought you signed up for.
I was talking about in game performance. Also cable is not a dedicated line, it shared between the people on that node. Also you dont have to dial out for DSL.