There's nothing that we can do regarding channel bans. Those are set by the ops in the channel, and only they can remove them.
I can't say anything about the reason you were given, as (it appears) that the forum software has edited your post to show [censored]-listed, rather than the actual word that you (probably) used in your post.
You might be able to talk to an op in that channel by sending them a pm message (using /msg). Since you probably won't know who to send the message to, use /who #channel to obtain a list of nicks in the channel.
This will give you a list..the ops are the people in that list with @ in front of their nicks.