30. In order to answer this controversy, if we look at the right of the exporter to get duty drawback that flows only from Section 75(1) of the Customs Act. Section 75(1) of the Customs Act, which has already been quoted hereinabove enable the Central Government to make rules by notification as to how such a duty drawback shall be allowed by the Customs Department. Therefore, Section 75 of the Customs Act, being a substantive legislation, provide such right to the exporter to claim duty drawback. Under sub-section 1 of section 75 of the Act, there are two provisos, where, we must concern about the second proviso which is prior to the amendment made under Finance Act, 2011 with effect from 08.04.2011, which shall read that, where any drawback has been allowed on any goods under sub-section 1 and the sale proceeds in respect of such goods are not received by or on behalf of the exporter in India within the time allowed under the FEMA Act, such drawback shall be deemed never to have been allowed and the Central Goernment may, by rules made under sub-section(2), specify the procedure for the recovery or adjustment of the amount of such drawback. However, by Finance Act, 2011 dated 08.04.2011, the words “except under such circumstances or such conditions as the Central Government may, by rules, satisfy” was inserted. Only pursuant to this insertion made in the second proviso to Section 75(1) of the Act, sub-rule 5 of the Rules was also inserted by the Central Government on 11.04.2011.