We didn't realize that we need to file monthly GSTR-1 returns and filed Quarterly returns. For Eg. didn't file JAN and FEB GSTR-1 but included JAN to MAR invoices in MARCH GSTR1 as we use to do in old regime so now the JAN and FEB GSTR-1 are showing pending. How to fix this? 3B was filed monthly and correctly for all months.