1. An assessee filed an ITR u/s 139(1) of the Income Tax Act for AY 2019-20. 2. After filing the return-but before completion of assessment, he got the name on the PAN card changed. 3. Because of this change, he got a notice u/s 139(9) asking to submit a response within 15 days from the receipt of the notice. 4. He forgot to give a reply. 5. His return was invalidated because of no reply within the time limt. 6. WHAT CAN HE DO NOW? Thanks in advance.