Working individual received a refund based on the old tax regime instead of the new one. How to claim the remaining amount?

Mihir Ashok Tanna, who works with a well-known chartered accountancy firm in Mumbai, has more than 15 years of experience in direct taxation.
He handles various kinds of matters related to direct tax such as PAN/ TAN application; compliance including ITR, TDS return filing; issuance/ filing of statutory forms like Form 15CB, Form 61A, etc; application u/s 10(46); application for condonation of delay; application for lower/ nil TDS certificate; transfer pricing and study report; advisory/ opinion on direct tax matters; handling various income-tax notices; compounding application on show cause for TDS default; verification of books for TDS/ TCS/ equalisation levy compliance; application for pending income-tax demand and refund; charitable trust taxation and compliance; income-tax scrutiny and CIT(A) for all types of taxpayers including individuals, firms, LLPs, corporates, trusts, non-resident individuals and companies.
He regularly represents clients before the income tax authorities including the commissioner of income tax (appeal).... more