A few things:
1). Please confirm that your STEAMID is: STEAM_0:1:7407456
2). I don't see a ban for that ID. (sourcebans.hyperiongaming.org) Can you tell us when it happened on which server? It doesn't show up in our primary logs.
3). When you try connecting to our servers, what does it say?
4). Yes, any attempt at using rcon commands without being authorized to will get you kicked automatically, and possibly banned for a short time to avoid brute force spamming.
I would remove all rcon cmds from all your cfg to avoid this from happening again.