If the matter be not adjusted to the satisfaction of the commission, it shall set a time and place of hearing, and give at least ten days' notice thereof to each party. The parties may appear either in person or by attorney. The commission shall hear evidence and otherwise investigate the matter, make findings of fact upon all matters involved, and such order or recommendation in the premises as may be just. A copy of such findings and order or recommendation shall forthwith be served upon each party. No proceedings shall be dismissed on account of want of pecuniary interest in the complaint.