My account was baned without hack

My account was baned and i didnt use hack to win one game i usually used Dva and zarya in rank and i live on HuYa it seem like twitch The bilzzard said i was use hack it is impossibility Yesterday i contact service they said it not be overturning the action I costed at least 500 dollar on this account and two season master why i used hack on this account Does anyone know what should i do I can swear i didnt use any hack or something to win one game

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