Acts 2017 478 6. (j) cooperate with supervisory authorities of other countries, to the extent necessary for the performance of his duties under this Act, in particular by exchanging relevant information in accordance with any other enactment; and (k) do anything incidental or conducive to the attainment of the objects of and to the better performance of his duties and functions under, this Act. Investigation of complaints (1) Where a complaint is made to the Commissioner that this Act or any regulations made under it, has or have been, is or are being, or is or are about to be, contravened, the Commissioner shall – (a) investigate into the complaint or cause it to be investigated by an authorised officer, unless he is of the opinion that the complaint is frivolous or vexatious; and (b) where he is unable to arrange, within a reasonable time, for the amicable resolution by the parties concerned of the complaint, notify, in writing, the individual who made the complaint of his decision in relation to it so that the individual may, where he considers that he is aggrieved by the decision, appeal against it under section 51. (2) (a) The Commissioner may, for the purpose of the investigation of a complaint, order any person to – (i) attend at a specified time and place for the purpose of being examined orally in relation to the complaint; (ii) produce such book, document, record or article as may be required with respect to any matter relevant to the investigation, which he is not prevented by any other enactment from disclosing; or