Refund Issue

I Bought Sylas 2 days ago and i've been playing him a couple of games. I Dont really like him he seems kind of weak so i want to refund him. For some reason it wont let me refund it in the "Purchase History" section it says Not refundable. I Bought him for 6300 BE and i have 1 refund left, Why wont it let me? (I Have no skins for him) (Screenshot Included) Thanks.
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