Permanently banned

So, 2 days ago I got permanently banned on my account(AKawaiiPotato1). And I want to know if I should write a ticket to riot or not. I got banned cause i flamed saying %%% once in the game to a Vayne {{champion:67}} that was trolling in a ranked match in my promos. Of course, i got really mad cause she was flaming while she was trolling and flaming me, but why i got banned for that? It's too hard to control the fuming. Anyways, %%% can be interpreted as Keep Yourself Safe :D.
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