There is no SteamID linked to that ban. That ban was to ban a VPN IP a hacker was using. Your STEAM ID is not banned, and you are more than welcome to play on our servers as long as you are not connected to a VPN service using this IP: 173.255.209.105
That is why you are not able to file an unban request, its because you're not banned. If you have to play with a VPN for whatever reason, pick a different city other than Fremont, California to connect to.