Intimation u/s 143(1) - ITR3

Arun G (Professional) (60 Points)

24 July 2021  

Received a defective return notice for 2020-21, asked for balance sheet. I duly supplied and had a pending amount 1021 Rs, which I paid and and added all information of the challan in ITR3. But now a demand has been raised for the same amount and says "unmatched Tax Payment - Advance Tax and Self-Assessment Tax - Challan is not available for the
AY" 

Not sure what this means. I did pay the tax and include the information in the return.