Do you mean the Registrar of BDMs in Suva? Are you writing to the correct address? They have a webpage through which you can contact them.
Otherwise Mormon Family History Centres can order in copies of Fiji BDM microfilms.
Go to www.familysearch.org
, Library catalog,Fiji,vital records, general deaths, take the call number for the film of the appropriate date, and order a copy of it at your local FHC or big library.
Whereabouts do you live?