State Bank Of India [SBI] — Non inclusion of wife's name in ppo

Address: New Delhi, Delhi, 110006

I kanwar singh regt no 3155718 my ppo number is s[protected], i am drawing pension from sbi shamli my ac no is [protected] i am trying to get my wifes name included in the ppo however the bank says that my ppo is lost thus wifes name cannot be added, my own copy too is lost, as per govt instructions only pda that is sbi can get the duplicate ppo, the bank has written to pcda allahabad in september 2016, however no dublicate ppo issued till date.
My grievence is that sbi as my pda should get the duplicate ppo at the earliest and include my wife name in it
Thank you