I am banned for basically no reason

Hello guys! I've got banned one game and i don't know why did i get reported and ofc banned afterwards. In that game i was GangPlank that was playing decent. In my team i had ashe that was inting my lane whole game becuase she had Jayce to support her. My team was flaming me becuase i didn't want to surrender a ranked game and defenitly reported me cuz of that. Ashe didn't get banned even if she ruined the whole possibly won game. Please could anyone understand what im saying and help me. Thanks
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