Kisan Credit Card Fraud

I am working as a manager in a PSU Bank. On 22/7/2015 at sainthal village of dausa distrcit rajasthan the bank sanctioned kcc of 1,80,000/- and disbursed 1,70,000/- to mr Jagdish gujar, mukesh gujar and mahesh gujar jointly. The land was in the name of jagdish gujar & was the principle borrower .Mukesh gujar and mahesh gujar were his son.After 3 -4 months jagdish gujar expired . On 30/5/2016 mukesh gujar and mahesh gujar approached the branch & deposited 1,79,000/- in full settlement of their kcc outstanding dues.The then branch manager and then loan officer deposited the money in their account and gave them no dues with their joint signature (signature of branch manager and loan officeron no dues)but didn't marked the closure of the account in CBS due to which entire 179000 remained as credit balance in kcct account. In sept 2016 the then branch manager credited interest subvention in that kcc account and even then also he didn't closed it in the system.Later on land mutation was done.