You received, in effect, 3 separate warnings that the name needed to be changed (resulting in some truly interesting letter to number replacements), and only afterwords were you banned until such time as the name was changed to something that didn't involve the word "nigger" in any form.
I would also like to clarify the chat rule regarding said word as I currently understand it from dupre and horns. "Nigger" itself is not an instant mute word like in the past, rather it is the context within which it is used that determines if it gets muted or not. The two main contexts that are not allowed, again as I understand it at this moment, are direct personal attacks against individuals and when it is used with violent or inflammatory intent.
e.g. "Sandersson you are a faggot ass nigger" or "We should kill all those niggers"
Nigga on the other hand is totally fine. I think.
If any of what I said here was not what you intended Dupre and Horns please do correct me.
