According to SourceBans, you were banned for reason Duplicate Account by the console. This means that someone was banned from your IP and the anti-cheat believes that your account was a duplicate account. You're going to need to use the proper template and explain why you think this ban was incorrect. Judging by the fact that the ban is permanent, the account that was banned on your IP was probably hacking.
EDIT: I checked and there was another account banned from your IP named thebeastboy89. This account was banned permanently by Shadow for hacking.