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

Because of the unstable and not ready technology of tablet (the equipment that use for the coach to substitute the player, to challenge on the replay and to call for time out) was working not so well. And that made Thailand side could not do the substitution the player and also challenge on the score so Thailand's coach went to ask for the action with the referee politely. But out of the reason the referee gave thailand the red card which did not seem to make sense at all. Moreover i was curious about the score that the referee gave to Japan for free and claimed that it was Thailand fault. What's the reason of giving that point to Japan? I just can not find any supportive reason for referee to do that. I think it does not make any sense for me about the decision of the referee. It made me question about how fair the referee is, is he really doing that for purpose? So i would like you to explain and investigate on this issue. Olmpics only happens once in 4 years, everybody including the players, coach, fan are all waiting for it and if there is no fair game then what is the point for the competition. Please do the right thing and do not take on one side.