Saharayn Universal Multipurpose Society — non receipt of maturity amount

Saharyan Multipurpose socity Certificate no.[protected] dated 31.03.14 for Rs. 50000/- for 3 years from Jalpaiguri branch ( code 2002)in the name of PANCHALI MAJUMDER
Above policy was matured on 31.03.17. But no maturity amount paid . Branch Officials nothing to say about maturity. Daily knocked the branch for payment, but not yet paid . Now what can I do. Please look into the matter.