I'm sorry to say it's just not worth it and honestly you do not have a strong case.

Volunteer barns are a different kettle of fish and it is not fair to go after a not for profit when many are volunteering and doing the best they can.

I had a situation with a barn that triggered me terribly. My case is/was much stronger than yours and I could have got them in a lot of trouble. But I thought of the clients, the kids. Dragging the barns name through the mud or causing trouble at another level was going to impact those kids. So I chose not to.

Less then 6 months later another employee tried to get the same barn investigated. It backfired on her big time as her complaints were petty and now she will not work in the industry again.

Just a quick example for you. I can go on but look at this logically. It is not worth the hassle and your case is weak.