Will Riot give me a one time refund or something?

I ACCIDENTALLY BOUGHT THE WRONG CHAMPION. I wasn't paying attention! I've already used all of my refund tokens, so I can't refund the champion myself. I accidentally bought Akali because I was tired and totally not paying attention. I was planning on buying another champion, and on top of that, it turns out Akali isn't even fun to play (for me.)

Is there any chance Riot will give me a refund for this one occasion? Have they done this before?