How to correct a return if tax regime is wrongly entered in the original return

I filed ITR-1 for A.Y. 2022-23. My total income for the year is Rs.13,24,446. Income tax calculated for that amount in the new regime is 149358. But unfortunately i selected the tax regime as "old regime" by mistake. This resulted in a demand notice  because the total tax due as a result is Rs. 218228

Consequently, all my subsequent refunds are withheld. Can some guide me how to correct this?

Thanks in advance