You are the referee

[Longines]

Erm we're talking the FA and junior football admin here so....

Fine the club. We'll come up with a reason later.
Fine the club again for not paying the first fine. The fact the league didn't write to you about the first fine is immaterial.
Fine the club when result cards get lost in the post.
Fine the club when you start sending them recorded and it inconveniences the results secretary (yes really...)