Standard Chartered Bank — excess amount refund / adjust against my outstanding

In sept2018 we have pay excess amount against credit card, asking for refund they send me wrong name (Initial name) dd,
We return this dd to bank on 29th sep, after that i close my emi against excess amount but still they have send a statement for outstaying amount. Last one month i track my money but same not received and not adjust my outstanding amount

Pls help sir.