[melitami]

Go to a school board meeting with your robot, your sponsors, and other supporters. Also, contact your regional coordinators for FIRST. They know who to contact, what FIRST is all about, and they're from outside the school, so maybe the school would listen to them as a semi-impartial third party.

Best of luck! You've got a lot of resources and people behind you, I hope your school listens and understands.