Affiliate Marketing Secrets

I’m atheist. My three-year-old daughter goes to a secular private preschool. All of the school’s documents say that the school is not religiously affiliated, and I made sure that the teacher understood we were atheist before I sent her to that school.
Today, my daughter sat down and recited a Christian blessing over her lunch. I asked her where she learned it, and she told me in no uncertain terms that her teacher has them “say the blessing” before eating. I asked her several times for clarification: is she the only one praying? Does she tell you to pray, too? Does this happen every day? And she made it very clear that this is a daily thing.
I’m absolutely livid. I paid $3,000 for a semester’s tuition at this school (that’s a third of my income) with the understanding that this stuff wouldn’t be happening there! Other than talking to the supervisors, would it be reasonable to request a refund, since the teacher misrepresented the school’s curriculum? If I’m not getting what I paid for, I want my money back!
Add to this that my daughter hasn’t learned ANYTHING since she started in school a semester ago, when it’s supposed to be the best pre-K education in the county… and I’m MAD! >:U