TDS eChallan

First contact your bank if they could make any changes. If they cannot then write a letter to your income tax officer (TDS) of your ward stating about the said mistake. They might make the above changes. But they respond after a long time. So you would have to wait for the response from same. Keep a follow on the same.

Assume the banker has done the mistake. The banker can rectify the mistake by writing to the Tax Information network where they upload the challans after receiving from tax payers. It is possible for the banker to do so .

Yes it is better to get it rectified through bank and if doesnt happen write to the officer in charge of TDS in your ward..

rgds