State Bank Of India [SBI] — deduction of service charge from my meager pension amount

Address: 400078

The great injustice is that my bank, (Sbi, bhandup w branch,) has deducted rs. 115/- per month from my pension sb account no.[protected] (Name: arokiam devasigamani) for non maintenance ofmonthly avg-balance of rs.5000/- my pension is only rs.577/-
It has been clarified by the assistant commissioner (Pension) of epfo, mr. Vijay kumar that the epfo has been paying service charge to sbi for the service to the pension holders and there is an agreement between sbi and epfo and the accounts carry zero balance account facility. It has been published in leading newspapers on12/8/2017.
But the bank still adamant to listen and the bank has not credited back the deducted amount to my account.