Banned for changing language to Japanese

Hello guys! I just got banned and I am sure it is because I changed my language to Japanese even though I play on EUW. I am Japanese and find it hard to play on english so I wanted to play it in Japanese. Is there a chance for an unban? I am sorry I did not know that is banable, I have spend a lot of time and money into that account. Yours, Cengo
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