Return invalidated as per sec 139 (9)

An individual's Income Tax Return (ITR) has been invalidated because the name on their PAN card differs from the name provided in the tax form. Unfortunately, the deadline for rectification has passed, and the client was unaware of a notice sent via email. The user is seeking advice on how to proceed, including whether the Assessing Officer can condone the error or if a revised return can still be filed.