To get refund The bank account details provided by me was correct , but The Banker sent to a wrong account

I was contacted  through the mail and received a reply like This

"as per the ITD data on  DD.MM.YYYY  The  REFUND AMOUNT was  CREDITED TO THE ACCOUNT NO. 0123456789101112

To get the refund, The bank account details provided by me was correct , but  The Bank  sent to wrong account. Which was not provided by me and it was not my mistake.

In my return MY bank details included  IFSC code, and valid Account number, but the Banker was credited to wrong account and reply as

"as per the ITD data on  DD.MM.YYYY  The  REFUND AMOUNT was  CREDITED TO THE ACCOUNT NO. 0123456789101112'. But its not my account and  i don't Know the Name Of the bank, branch like IFSC code ,name of the account holder  details, and not a  valid Account number

How can I get the refund back?