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

If they'd wanted to play with true sportsmanship , there isn't even a need for such technology , such as the Challenge system . WHY ? If you have sportsmanship , ADMIT your mistake and why do you need the Challenge system. International volleyball doesn't play sportsmanship anymore , volleyball is just a sport where teams compete AND try to gain pride for their country . This isn't sportsmanship at all

I don't understand why the country like Japan that keep telling the world, they are an honest person. But in the game, when they won with an unfair points, why are they still happy?

I'm dissappointed that I used to admire Japan.