Refund of excess tds deducted and paid to government

Dear sirs

One of our client a Nationalised bank branch had deducted TDS at a higher rate from a NRO account. The bank overlook the Tds rate and deducted TDS on interest on FD at a higher rate and remitted to the government. Now the party approched the bank for getting refund of the excess tds deducted by bank . If there is any remedy for the above case