9 20. (1) Every summons shall be under the hand of the Chairman of the Commission. Service as summons. (2) Any summons may be served by delivering it to the person named therein, or where that is not practicable, by leaving it at the last known place of abode of that person, or by registered post. (3) Every person to whom a summons is served shall attend before the Commission at the time and place mention therein, and shall answer the questions put to him by the Commission or produce such documents or other things as are required of him and are in his possession or power, according to the tenor of the summons. 21. (1) Every offence of contempt committed against, or in disrespect of, the authority of the Commission shall be punishable by the Supreme Court as though it were an offence of concept committed against, or in disrespect of, the authority of that Court, and the Supreme Court is hereby vested with jurisdiction to try every such offence. (2) An act done or omitted to be done in relation to the Commission, whether in the presence of the Commission or otherwise, shall constitute an offence of contempt against, or in disrespect of, the authority an of the Commission, if such act would, if done or omitted to be done in relation to the Supreme Court, have constituted an offence of contempt against, or in disrespect of, the authority of such Court. (3) If any person(a) fails without cause, which in the opinion of the Commission is reasonable, to appear before the Commission at the time and place mentioned in the summons served under this Act; or (b) refuses to be sworn or affirmed, or having being duly sworn or affirmed refuses or fails without cause, which in the opinion of the Commission is reasonable, to answer any question put to him touching the matters being inquired into, or investigated by, the Commission; or (c) refuses or fails without cause which in the opinion of the Commission is reasonable, to comply with the requirements of a notice or written order or direction issued or made to him, by the Commission or. (d) upon whom a summons is served under this Act, refuses or fails without cause, which in the opinion of the Commission is reasonable, to produce and show to the Commission any document or other thing which is in his possession or control and which is in the opinion of the Commission necessary for arriving at the truth of the matters being inquired into, or investigated, Such person shall be guilty of the offence of contempt against, or in disrespect of, the authority of the Commission. Punishment for contempt.