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

Yesterday, I could accept the result of the competition between Japan Vs Thailand, if the game was fair without any defamed help from the referee. Further more the poor-technology for sending the signal to replacement or challenge that did not work so the Thai coach had to asking the reason why " Thailand could not replacement the player in the important score on set4 or why could not challenge when the Japanese players overstepped to Thailand side. Even more the thai coach was got the red card and lost two points to Japan without the good reason for Big match like this. Finally, I would like to say that all of my life that I have seen the Volley ball , The match between Japan Vs Thailand was the most defamed game to win from the host and every one could see the cheat game that occurted.