I filed my father's return on 07/07/2023 (before due date) and didn't claim any deductions as opted for new tax regime. E-Verification was done after 1 month on 16 august 2023 because of that tax filing date changed from 7th july to 16 august by IT department. My father has got a demand notice from IT department . Now I am trying to file revised return to opt for old tax regime and claim deductions . But IT portal is not accepting acknowledgement number of original return as date has been changed. So my query is how to file revised return if e-verification is not done within time for original return. Has anyone faced this issue?
Please do help me as 31 dec is the last date of revision. Thanks in advance