Urgent

No need to file revised return unless and untill there is a notice from the department.

You may write to the AO for rectification of the last order and attach copy of all the requisite documents (Copy of earlier notice, copy of payment challan)

Also write to them asking them to take a cognigamce of the payment effected and amend there records (DC Register) ASAP.

regards

Just meet the jurisdictional AO of ur client and give them in writing stating all the facts from begning till payment of the demand...no need to revise return....

Revised return can be filed only if there is any OMMISSION or MISTAKE in filing ur IT return. A revised return cannot be filed in response to the notice u/s 143(1).

Meet the concerned IT officer with the regular tax paid challan along with the copy of 26AS.

Since ur payment status is reflected in the IT website i.e in 26AS, that itself gives you the acknowledgment for your tax payment, accepted by the authorities.

The advisable solution is to meet the concerned AO along with the written submissions describing all the facts. There are numerous repetative demand notes are coming to the assessee despite of paying off the same.

A return can be revised from your end only when you have made a mistake, but if you have not made any how can you revise it or rectify it? Its better to meet the jurisdictional AO personally and let him know all the facts with requiste documents and their supportings.