REALTORS® are different from non-member licensees in that they voluntarily subscribe  to a strict Code of Ethics .

If you believe that a REALTOR® has violated one or more  Articles of the Code of Ethics, you can file an ethics complaint alleging a violation(s) through the local association of REALTORS®

www.nar.realtor/PSefnorcement

TREC:

How to File a Complaint:  If you feel there has been a violation of The Real Estate License Act (law), or TREC rules, you have the right to file a complaint with TREC .

www.trec.texas.gov/public/how-file-complaint

Texas Association of Realtors:

Resources to file an Ethics Complaints: www.texasrealestate.com/members/legal-and-ethics/ethics/ethics-complaints