Indian Post Office — payment due

Address:

Purulia, West Bengal

maturity complete few years before but payment not clear, they only told it is a death claim so it is too much time to respond.so please help or tell me what i do if my father and mother both are no more and i am the only son or only nominee.therefore now I only a wife and a 4 years son having no more parents,so i strongly need my father and mother's deposit ....called NATIONAL SAVINGS CERTIFICATE
CERTIFICATE NO-0JEE 5524J0 OF RS10000
CERTIFICATE NO-0JEE 5524J1 OF RS10000
CERTIFICATE NO-0JEE 5524J2 OF RS10000
post office of issue-Raghunathpur
date of issue[protected]/02/1996
registration no[protected]