First discuss the complaint with the director of the school. If the complaint is not resolved you should contact:

https://www.twc.texas.gov/sites/default/files/wf/docs/csc-023r-cancellation-and-refund-policy-for-residence-schools-twc.pdf

Notification of Complaint to the Texas Workforce Commission:
Students who have an unresolved grievance or complaint regarding school programs or staff may contact the Texas Workforce Commission:
Texas Workforce Commission
Career Schools and Colleges, Room 226T
101 East 15th Street
Austin, Texas 78778-0001

Phone: 512-936-3100
Website: www.texasworkforce.org/careerschoolstudents