wgonly filled the 3b for the month of March

WHICH COLOUMN IS WRONG...
PLEASE CLARIFY...

In case wrong filing of info in GSTR3B, please correct the details in GSTR1. Final info will be of GSTR1. Any tax payable/refundable will be adjusted on the basis of GSTR1

if it has been filed then reset can not be done . there is not legally said that it can be rectify next month, legally have to wait for revision if taxes are being more payable pay it and wait for revision which is not officailly announced but certainly it will.

it should be Feb instead of March as filled nill

In GST there is no revision of return is available.
& for any refund Ur GSTr 1 & 3b return ( export ) should be match.

3b return is more important then GSTr 1 because Ur Electronic Credit Ledger reflects as per Ur 3b return, even the tax is deposited on the basis of 3b

now , I think u must have been filed the Feb 3b in march, so any mistake done therein can be rectify in March 3b .