The extent to which there may be liability on the bond because of the collection of excessive gas and electric rates subsequent to March 24, 1964, and the failure to refund excessive charges for the period between July 4, 1963, and March 24, 1964, by June 1, 1964, cannot be determined in this certiorari proceeding. Hoskins v. Hotel Randolph Co., 206 Iowa 932, 938, 221 N.W. 442. Except as modified in Division XII hereof the writ is annulled.