Futbol Penalty

I saw a soccer match by my TV, when I saw a random player that punched in the face to other player, the reffere doesn't saw it and the impact was really bad, the partners of the player that was punched, claimed the penalty but the reffere doesnt saw it, so he can't do nothing.

Organizers must do something, the fault was really bad and it cannot happen again, the soccer is a clean sport,and this type of faults cannot happen, even more if it serious. The soccer fanatics, were really angry and they dont accept this,even if the reffere didnt saw, cause the fault was really bad.