Wrongly submitted form 15 g, please give remedy..

My client has taxable income

the bank told him to submit Form15 G otherwise 20 % TDS and 12.36% service tax would be leviable...

So, mistakenly he submitted Form 15 G for F.Y. 2011-12 and F.Y. 2010-11.

Accordingly his entire interest income is refunded to him by the bank (as I saw his passbook today).

As per my knowledge, he should not have submitted Form 15G AS HE HAD TAXABLE INCOME....NOW CAN SOME EXPERT PLEASE HELP ME BY GUIDING AS TO HOW SHOULD I RECTIFY HIS MISTAKE  ??