Please give a legit explanation why team Thailand lost two points and does not allow substitutions s

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The result of the Japan Vs Thailand supposed to have no meaning to me at all. But after I watch the game, I am very angry. It's so unfair. I can see even Japanese player Saori Kimura look so shameful after the match. There are so many unanswered confusion left behind. We need the answers why Thailand's substitution is not allowed. We need to know why the referee can make so much attempt for the challenge. It is definitely not convincing to punish 2 red card in the last set of the match, this is the referee himself to create so much confusion and giving no clarification at all. It is of course the coach's right to clarify. There are a big suspicion of corruption behind. Shame on the referee and the Japanese Team. We have to appeal to the result of this match