How to claim refund

In case the assessee has made a material mistake while filing IT returns, he/she must revise the returns as soon as it is discovered. You will have to write to the AO stating all the details and request them to recitify it or atleast show a way to rectify it.

You cannot file returns using wrong PAN number even if TDS was deducted on the wrong PAN number. Immediately inform the employer to not deduct TDS on the wrong PAN.

Thanks mihir

But I have filled belated returns in last years so I can not revised the returns.

But now what I have to do for getting the refunds and also what to do for filling the returns for A.Y. 2011-12 ?