under the Customs Notification No.25/99 dated 28.2.99 and enclosed Annexure III vide their letter dated 1.4.2014, the respondent, instead of issuing the certificate, asked the petitioner to explain as to (i) why items declared and cleared as relays under chapter heading 85 36 should not be reclassified under sub heading 9032 8990, (ii) why the items imported should not be classified as parts of automation apparatus under Central Excise Tariff heading 9032 9000, (iii) why the permission granted for import of competence under concessional rate of duty as per Customs Notification No.25/99 dated 28.2.99, should not be denied, as the components imported as well as the final product manufactured appear to fall under different chapter headings other than those specified in the notification and (iv) why the differential customs duty on the goods imported under concessional rate of duty under bond should not be demanded along with interest, for which the petitioner sent a detailed letter dated 1.4.2014 explaining the factual position about the product manufactured by the petitioner, specifically clarifying that they are manufacturing only two items, namely, P40 and P44T which are nothing but relays and confirmed that products like MU Agile AMU, DAP server etc., do not qualify as relays. Subsequently, the petitioner also appeared before the respondent on 4.4.2014 and 10.4.2014 with the technical officers and their counsel and explained their case that the product manufactured by them are only relays and they are eligible for claiming the benefit under Customs Notification No.25/99 and thereupon requested the respondent to issue the certificate for HA/HAMIDOS range of relays. But the respondent rejected their request on 6.5.2014.