ITR-6 (AY_2020-21) - 400 cr. TO in FY 2017-18 ? _ Wrongly filled as "Yes". 30% taxed instead of 25%

This query is : Resolved

PRABHAKAR PAL (Querist)
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12 September 2021 While filling up the ITR-6 for domestic Company for AY 20-21 (Pr. Yr. 19-20) a wrong entry was given as "yes" in the column - "Whether total turnover/ gross receipts in the previous year 2017-18 exceeds 400 crore rupees? (Yes/No) (applicable for Domestic Company )". It was a small clerical mistake, but the effect was 'heavy' Rs. 33 lakh having been paid in excess.
As a consequence, 30% tax happened to be given with the 'self Asst. Tax'. It should have been 25%. In the Pr. Yr. 2017-18 the Turnover was 41.00 Crore. Therefore, Rs. 33 Lakh + has been paid excess.
Due date for revised return has expired on 31.05.2021.
How can the assessee get refund? Please advise and suggest the way of claiming Refund.