Cppc Sbi Kolkata — da on pension

Ppo no m/03817/2013, colonel somnath praharaj (Retd) pensioner id: [protected]l, am holding pension a/c at sbi, rly station br, barrackpore, wb. Since i was serving after retirement i was not getting da on pension. I have since finally retired wef 01 jan 2018. I have submitted all requisite documents to this effect to my bankers and cppc. Inspite of the same, requisite da on my pension has not been remitted for the month of jan2018.
I kindly request the concerned authorities to take necessary action to remit the same at the earliest,