I received the following email:
I believe this to be highly out of proportion and unjustified the duration of this ban especially since i do not have nor ever had an LoL account...Greetings sumoldeananas,
Actions that have been performed on your account are in violation of the League of Legends Terms of Use. You can review these terms at http://www.leagueoflegends.com/legal/termsofuse
Due to the severity of this violation, your League of Legends account has been banned until Tue Feb 22 22:22:22 UTC 2203
If you have any questions, contact our Player Support team at https://support.leagueoflegends.com/home
Riot Games Player Support