Actual Salary and Form 16 discrepancy

My father's organisation considers income from March of calendar year to Feb of next calendar year for the purpose of salary income of employees for form 16 purposes. My father has filed considering the income as per above income in f.y. 2021-22 and 2022-23. however, income in 2021-22 and 2022-23 were around 4.80 lakhs and shortfall in income considered is only 4k each year. But he retired in f.y. 2023-24 in the month of feb-24, and now his total income comes around to salary of 12 months of salary income, due to inclusion of march-23 salary in form 16, resulting in higher fig. in ais, 26as where in actuality it's only salary of 11 months. this has resulted in unnecessary tax on this year's income. the organisation is not co-operative as to revise the tds return on their end. how should I proceed. will I be able to resolve this issue with dept by just filling a response to the defective notice issued.