Life Insurance Corporation of India [LIC] — Wrong survival benefit was given

Website:

www.lic.in

I am customer of LIC . Policy no[protected] branch 98 E .Date of commencement and date of commencement of risk of policy 28/12/2007 sum assured basic plan 2 lac
premium paying term 12 years.mode of pay -monthly (Rs 987).
1)for policy term 12 yr...15 %of the under basic plan
means after 8th year complition I should get Rs 30000 as sur.benefit.I got a letter from LIC Dated 04/09/2015 which showed I will get RS 25065 .Finally I got Rs 29008 in my bank account.I paid all monthly installments regularly so how can this happen?
I didn't get any massage of dues from LIC.Where is my Rs 992.What do I do now?
Hawale Santosh Tejrao
[protected]@gmail.com
at Modha bk Tq Sillod Dist Aurangabad
PIN 431112 Maharashtra, India