DOTEL/R/2017/80191

I Mrs Saroj Prasad, w/o Late Bindeshwar Prasad is a pensioner , my PPO No is - TA/BR/TDM/MDN/IPP/DC-1716. I am getting pension through State Bank of India , Kaluahi, Distt Madhubani Bihar in my Account 11610947322.
In my revised PPO dated 2/11/6 ref no CCABR/3-Pen/2016/1360, it has been advised to pay Rs 15664/- as basic from 1/1/2007 to 9/6/2013 alongwith DA as per current rule.After this period Rs 16536 till 9/7/2016 was advised to be paid.
But pension paid is of lesser value starting from April 2015. Also there is chances of getting lesser arrear as per revised PPO.
In this regard letter has been given to Account officer, DoT, O/O Controller of Communication Accounts, pension cell, Patna.
In this regard also, i have discussed to Central Pension Processing Cell, State Bank of India, Patna but not getting any proper response.
Requested to provide information like why this deduction is being carried out along with basis of deduction with all calculations, pension slip starting from 01/01/2007