100% DA neutralisation was sanctioned to pre 2002 retirees prospectively from October 2023 (i.e., without any arrears)
although those who retired on or after 1/11/2002 were getting it from 1/2/2005 in terms of 8th BPS.
Among the pre 2002 retirees, almost all who had retired as workmen had not at all been affected by the old (tapering) DA formula and were already getting 100% DA as their basic pension was within the first slab itself. In respect of some others, only a small portion of their basic spilled over to the next slab and they were being marginally affected. These two categories were sanctioned exgratia of ₹800 & ₹450 respectively, purely as a goodwill gesture (as their pensions were very low) so that they too got some increase in pension along with other pre2002 retirees.
Thus, technically, you are eligible for an
exgratia of ₹450. However, the bank appears to think that the exgratia is applicable only to those who were already drawing pension when it (exgratia) was introduced in October 2023. Anyway, you may make a representation and get their response.
I think you may not be getting the other exgratia too that was sanctioned to all pensioners right upto 31/10/2022 with retrospective effect from Nov 2022.
K N Ramani