Upon receipt of any verified complaint which concerns a licensed dairy produce exchange, the director shall proceed to make a thorough investigation. In this connection, the director:

1. (a) May conduct hearings, of which all interested parties shall receive due notice, and may require written statements which set forth the views of any or all contending parties.
2. (b) Shall invite the cooperation and solicit the opinion of the Federal Trade Commission and the Economic Research Service of the United States Department of Agriculture.