Gym not enforcing the age policy

Crunch doesn't allow sub 18 year olds in the gym, even with parents.

We have 2 groups of families who bring their kids in, approx 9-10, and the kids have been sitting on machines (parents not with them), in one instance using the leg press well outside of the range that they should (200lb plus and untrained).

Gym staff refuse to do anything, I let corporate know but it's been months. Not sure what to do