YMCA review: swim lessons

I signed 5 children up for swim lessons 1 month in advance with a statement for the oldest child clarifying she has special needs (12 yrs) and would do better in the 5 year old class. She was placed in the 6 and up class. Class 2 I asked the coach if she is doing good or if she needs to be placed elsewhere, and the response was, “she is doing great and she is fine where she is placed.” Class 6 I noticed she really needed to be moved and made a phone call and left a message for the director or aquatics to call me. Class 7 I left a message and 3 days later I called and spoke to the aquatics director. She informed me she can’t refund the money and doesn’t know if she can put the child in the younger class and wanted to know what else she can do.
All classes for her are on Saturdays at 8am. There are a total of 10 classes for the session payment. It was stated on the signup sheet that the students could be switched during the session if progress is made and the child needed to be moved due to swimming qualifications.
I want my money refunded for this child, her other 4 siblings that are being taught lessons have progressed, but the YMCA does not know how to teach children with special needs and should have called or said something after class 1.