Gst return taxable value entered wrongly

hi friends

i have filled my gstr 3b quarterly return

where I have entered total taxable value wrong

instead of entering 6 digits, did entered 7 digits

I have paid taxes correctly only taxable value is entered is wrong

please help me how to correct it

I have not seen gstr 3 b option in website

I have filed gstr 1/iff correctly

thanks