Mistake in Taxable value GSTR 3B & GSTR 1

Dear,

I am filing monthly GSTR 1........I have filed GSTR 3B of Sept 2020 shwing Taxable value Rs 38,25,870/- in place of 38,258/- , also GSTR1 filed with correct figures..

Kindly help me to know how to rectify the taxable value over stated in GSTR 3b

TO BE NOTED OUTPUT LIABILITY WAS FILED WITH CORRECT FIGURE & ONLY TAXABLE VALUE OVER RATED MISTAKENLY & THAT IS ONLY IN GSTR 3B