Any person employed by the commission in the consumer advocate division may be assigned by the commission to investigate, hear, and, wherever possible, adjust any individual or general complaint made by any person against any such public utility, wherein its investment, property, service charges, or claims preferred against it, may be involved, and may hear and take proof, and, in the event the commission employee is unable to effect a satisfactory adjustment of any such complaint, then the commission employee shall certify the same to the commission, with recommendations in the premises, whereupon the commission shall, after hearing, make its final order, which shall be binding upon the parties to any such controversy.