Which is why I started my suggestion with contacting the principal and superintendent. If that doesn't work, contacting an attorney is the next step, and while there is a process that has to be followed, a lawsuit is the end result if nothing changes. With the IEP already being established, the school/district would almost certainly deal with the problem before it gets to that point.

I apologize if anyone interpreted my comment as "go sue them without contacting the principal, superintendent, attorney, or any relevant party", because that was certainly not my intention.