Tds claim

Hello evry one, I have query that a deductor had quoted wrong PAN of deductee in his TDS return 4 which Tds deducted in March 11. Deductee who is following cash basis of accounting claim the income in the year of P.Y. 2011-12. On the online 26AS the credit of TDS not shown. What is the way out of it? Can deductor revise TDS return now by rectifying mistake? Nd if not what option available to claim the same to deductee? Nd cn by filling reaturn of income by manualy, deductee better of the than online filing in this case? Thanx in advance....