You should e-mail them. This is not right. Disney is getting more pathetic as the months go by. You should be furious and let them know this. They have no good reason to ban you. I think the bans may be computerized, as in the people really never see the chat, the computer does it automatically.
An example of disneys Failing ways.......Look what they did when the Disney company bought the Power Rangers franchise...killed it
Edit: I looked at their rules there in the link...maybe it was this? Weather it is the reason or not, that's still not right.
4."You must have copyright ownership of all material that you post on our message boards and in our chats. No articles, recipes, song lyrics, art, graphics, or other material may be posted without the express written consent of the copyright holder."