Regulation 18 (1) Where the Director-General is satisfied that an amount which was not due has been paid to the Scheme, the Director-General may, subject to the provisions of these Regulations refund the amount to the person entitled to it. (2) A refund shall not be made where the member of the Scheme or the dependants of the member of the Scheme have already been paid the amount as benefit. (3) The Director-General may (a) withhold the whole or a part of the excess payment and offset it against an amount due to the Scheme from the person who received the excess payment; or (b) require a person who made an excess payment to apply in writing for refund of the excess payment and to furnish the Director-General with the information necessary to determine the circumstances under which the excess payment was made and the amount involved.