The next step to combat this issue is to develop a plugin that will detect alt accounts and notify our admins in-game as well as log it. Don't think just because no admin is on that you wont get caught because it will log all detection's and I will be checking. In the future the plugin will likely auto ban once I know it is working 99.9%. If you have used an alt account in the past obviously you will not be perma banned for using it in the past. However going forward if caught you will be banned. So I recommend that you do not ever connect again to any of our servers with your alt account.
The new rule added is #18 under General Rules(http://defyclan.com/hub/rules/csgo-rules/).