Strange - illegal batter or what

[brost]

This should be covered by your league's rules. In germany, this is pretty simple: If he is not on the line-up, he's not allowed to play and whenever a player who is not allowed to play plays, the game can be protested and will be scored 9:0 for the other team.

Anyway, when the coach tried to substitute a player that is not on the line-up, you should have warned that coach.

Anyway, you should not have to worry about that decision now since that is up to the league commissioner.