Wow...this is just so low...here's what I would write if my crew had to come up with that letter:

Dear LOSERS,

We hesitantly apologize that our actions were not in line with your demented expectations resulting from a lack of knowledge and understanding of the rules of basketball and the mechanics whereby our actions are arranged. We hope this situation will awaken you to the fact that we are the authorities on the rules as evidenced by our experience and knowledge gained from years of doing the games and all the meetings and testings we've had to endure. Thank you and we hope you get a set of officials next year that will definitely make you forget us!

(Secretly, inside, I'm feeling a bit evil, yet serene!)