State Bank Of India [SBI] — wrong deduction of bank charges on transaction over pos

Address: Bareilly, Uttar Pradesh, 243006

I have made a payment only of rs 340/- as per following detail. — thank you for using your sbi debit card 622xx2774 for a purchase worth rs340.0 on pos [protected] at vani medical hall txn#[protected].
But at above transaction the rs 56.50 has been debited as bank charges for pos payment as per following narration of internet banking'_aug-2017) debit
[protected] mds pos sur/ser chgs stl 230817 56.05 2, 879.17
Pl refund my extra bank charges.