Non payment of fdrs

My parents had their Saving and Fixed Deposites accounts with SBI CHB Branch, Jodhpur, After Death of my mother in 2019, I personally visited the branch with my father to change the accounts in the name of my father (the photocopy of the application is being enclosed) but the concerned officer suggested that as the FDRs are not matured so there will be loss of interest so wait till the FDRs mature. On inquiry it was informed that as there is nomination in the accounts so there will be no problem at the time of making the payment. After death of my father an application for payment of Saving Account and four FDRs was submitted by my son (Nominee of the accounts). The payment of two FDRs and SB account balance was paid but the 2 FDRs ( Photocopy enclosed) were not accepted with a reason that there is no nomination in these accounts. As these FDRs are being made from transfer the amount from joint account of my parents and the nomination in both CIF of my Mother & father the nominee is Grandson Mr. Deepak. As in CIF of my parents the nomination has been done so these FDRs should be paid to the Nominee. Please guide in this regard,