That’s pathetic that they had sight of it. Maybe you can ask them to confirm if there were any non year 9 pupils playing in any of the other games in the comp? Just a yes or no. Bet there was.
Ridiculous rule and not one you normally see at all. I always thought the limit was the age and nobody above that - anyone under it is fine etc.
Annoying it is actually a rule though as technically it’s been broken ☹️
I’d suggest trying to get hold of the team lists for previous games in the...