If, when the Bondholders Incorporation Commission has disposed of all matters and proceedings before it or likely to come before it, the Controller and Auditor-General certifies that in his opinion the total amount then received or thereafter to be received by way of fees and levies under the Companies (Bondholders Incorporation) Act 1934-35 exceeds the total costs and expenses of the Bondholders Incorporation Commission then incurred or thereafter to be incurred, the amount of the excess, if it is not less than $200, shall be refunded or remitted to the persons by whom amounts exceeding $60 have been paid or are payable by way of hearing fees or levies under the said Act, in proportion to the total amounts so paid or payable by them respectively.