State Bank Of India [SBI] — wrong account debit

Address:

713145

I have a car loan with sbi .Sbi debited my EMI amount timely. Bank wrongly debited Rs 5900/- from my loan ac.Bank manager assured me he reverse this amount.But manger doing unnecessary delay for 4 months.He told me he have already taken permission from higher authorities but his sbi server not allow him to credited this amount to my ac. Plese help me.
SBI MANTESWAR BRANCH(14067)