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

I watched the match yesterday, it was obviously unfair for Thai team anymore. Those referees did not give any chance for Thai team to substitute a player by blaming that Thai team had not touched the button. But, Thai team had touched it before. And, the referee said did not show, in facts why you use things that are such a terrible technology in this game. Japamd can substituted every players but Thai in a few point about winning couldn't do. These expressed to all of the Volleyball fans that this match isn't fare anymore, the judgement said NO NO and it isn't the point he could let them substituted or challenged. And gave 2 points for Japanese team, unfortunately the referee did that and didn't be open-minded to listmen our argue for those points. Could you please investigate this match for proving clearly to Thai team.