What should I do if I feel business is being conducted unethically?

For incidents regarding the inability to submit an offer or if you feel the listing agent is conducting business unethically, per Section 9 Enforcement of Rules or Disputes of MLS Rules:

Alleged violations involving unethical conduct shall be referred to the professional standards committee of the association of REALTORS® with which the Participant or Subscriber, as appropriate, holds primary REALTOR® membership for processing in accordance with the professional standards procedures of the association.