law: 30. Existing rates, etc., to continue until altered by Board.-
  As from the appointed day, all rates, fees and other charges in relation to any port, shall, unless and until they are varied by the competent authority in accordance with the provisions of this Act, continue to be levied and collected at the same rate at which they were being levied and collected by the Central Government or, as the case may be, any other authority immediately before such day.