In most cases if you actually have "no idea" what you did wrong and your account was randomly banned, it's usually because of your characters name. They ban you so that you have to come post in the petitions forum...they will then alert you to the reason for the ban being your character name and tell you that they are unbanning the account and tell you to petition in game for a name change. The staff will then change your name in game to the name you request (assuming the requested name is okay under the naming policy).
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