Anti-dumping duty adjustment: provisional excesses must be refunded and higher final duties are not additionally collected. Where the Central Government, based on the designated authority's final findings, fixes an anti-dumping duty higher than a previously imposed provisional duty, the importer need not pay the difference; where the final duty is lower than the provisional duty already collected, the excess must be refunded; and if a provisional duty is withdrawn under the withdrawal provision, any provisional duty already collected shall be refunded to the importer.