We were definitely aware of it, and we looked into hiring a lawyer. It would cost $5000 to retain a lawyer, and if we lost the case then we lose the money.
Most parents loose their battles with the school districts, and it takes a lot of time. You also have to repeat this process every single year.
It was pay a lawyer $5000 and take a risk or pay $7500 for a private school that we knew would do the job.
I understand your quandary and your choice as being best for your family but just was curious if your rights were explained to you. Good luck in the future.