The Commission shall have the power and authority to issue subpoenas and to compel the attendance of witnesses at any place within this Territory, to administer oaths and to require testimony under oath before the Commission or Division in the course of any investigation or hearing conducted under this chapter. The Commission may serve or cause to be served its process or notices in a manner provided for the service of process and notice in civil actions in accordance with the rules of court. The Commission and the Division shall have the authority to propound written interrogatories and the Commission may appoint hearing examiners, to whom may be delegated the power and authority to administer oaths, issue subpoenas, propound written interrogatories and require testimony under oath.