Sir, please think logically.
What is the size of tax mistaken?
If it is big suppose more than Rs. 1 lack or more than Rs. 5 lacs then pay it immediately with interest and
write letter to the department.
if the amount is neglible like 10000 or 5000 then pay the same with interest and keep quite.
while you are filing next HY return, you check for the entry previous period amounts, there you mention
the present payment.
Further, if logically thought, If scrutiny made, they will intimate over phone or thru letter, then submit the challans of payment made by you.
Otherwise at the time of audit, if they raise questin show the challan. simple.