[ozzy6900]

Not knowing what "rules" you enforced (because you do not explain the ejection), it's hard to say if were you right or wrong. I have 2 points to make on what I read:

1. I don't know how you warned the coach or what you said. Do not use the "this is your warning" crap or challenge them by saying "one more word and you are out". Listen to the coach. When he stops talking, tell him what you saw and what you called, then say "Okay coach, we're going to get back to playing ball now" and walk away from him. If he follows you arguing, he has signed his ejection warrant.
2. When you eject a coach and he pulls his team off the field, he is challenging your authority. Inform both sides that the game is over and don't say forfeited. Let the league officials handle this. Get your partner and leave - just leave. Report to your UIC or fill out your report (we have to write reports). The game is over. Do not argue with the coach or try to negotiate. He ended the game and took his team off. Let him live with it.