Use the template and you will most likely have another chance:
Ingame name: (your name, correct caps)
Where you are banned: (which server can you not enter)
When you were banned: (date/month/year, if you don’t know leave it blank)
Who banned you? (If you do not know leave this blank)
Why you were banned: (message when you try to join)
Why you should be unbanned: (Why the mod team should give you another chance to play)