PSA: Your account and any money spent on it is not your property.
First part of section 4A in the Terms of Use:
*** All rights and title in and to the Properties, and all content included therein*** (including, without limitation, user Accounts, computer code, titles, objects, artifacts, characters, character names, locations, location names, stories, story lines, dialog, catch phrases, artwork, graphics, structural or landscape designs, animations, sounds, musical compositions and recordings, Riot Points (defined below), audio-visual effects, character likenesses, and methods of operation) are owned by Riot Games or its licensors.
I say this only because some people seem to belive that they're entitled to their money back if they're permabanned. Even you think it is unjust, they don't actually need a reason to ban you nor give you a warning. See below:
RIOT GAMES RESERVES THE RIGHT TO SUSPEND, TERMINATE, MODIFY OR DELETE YOUR ACCOUNT AT ANY TIME FOR ANY REASON OR NO REASON, WITH OR WITHOUT NOTICE TO YOU, AND WITH NO LIABILITY OF ANY KIND TO YOU.
TL;DR: It doesn't matter how you got banned. Riot doesn't owe you anything.