How to get refund for 2008-2009,2009-2010

Dear Sir ,

one of my client has refund for A Y 2008-2009 and AY 2009-2010 those returns are manually filed.

Long back he got a letter from concern ITO Regarding Bank Account Number Mismatch on that time he was not in that address 

What are the procedures for that refund He Has all documents Like Form 16, Form 16 A

Please help me sir as early as possible