TAX AUDIT REPORT U/S 44AB : ABOUT PAN NO OF AUDITORS
The IT return will be treated as defective return U/s 139 by the assessing officer; Within 15 days from the date of his notice you can rectify. But for the same, your return will not become invalid at all.
You have yet two alternatives-
1. File a explanatory letter to jurisdictional AO suo motto mentioning right PAN of CA.
2. If you are overcautious, please file a revised return immediately and get acknowledgement in ITR V.