2.
In case of import of spares, the installation certificate is to be produced within three years from the date of import. In your case, the import is done only a couple of months back, hence there is no need for any immediate rush for the installation certificate.
Also, officers are generally a bit more busy with office work during the month of March and also few officers already entrusted with election duty work.
I suggest to wait for few months.
7) that the capital goods imported, assembled or manufactured are installed in the importer's factory or premises and a certificate from the jurisdictional Deputy Commissioner of Central Excise or Assistant Commissioner of Central Excise , as the case may be, is produced confirming installation and use of capital goods in the importer's factory or premises, within six months from the date of completion of imports or within such extended period as the Deputy Commissioner of Customs or Assistant Commissioner of Customs, as the case may be, may allow :
Provided that in case of import of spares, the installation certificate shall be produced within three years from the date of import :