Why have I been blacklisted?

Name: Lucien
Game: Minecraft
Steam ID or Minecraft name: Malicious_H
Time you were banned: I received an email on the 14th.
Reason why you were banned: I honestly have no idea, was I offline for too long?
Explanation of why you think you were wrongly banned: I haven't even been on much lately so I don't see why I've been revoked & blacklisted.

Thanks.

Oh and my Steam ID is zuru100 if that helps :L