The manner in which disputed claims shall be presented and the reports thereon required from the claimant and from employers shall be in accordance with regulations prescribed by the administrator. Neither the administrator nor the examiners shall be bound by the ordinary common law or statutory rules of evidence or procedure, but may make inquiry in such manner, through oral testimony or written, printed or electronic records, as is best calculated to ascertain the substantial rights of the parties and carry out justly the provisions of this chapter. A complete record shall be kept of all proceedings in connection with a disputed claim.