Wrongly feed in GST R1

I am FILED IN GST R1 AT THE TIME OF GST AMENDMENT RETURN FILED WRONGLY .B TO B FOR THE YEAR 2019-20 AMENDED IN SEPTEMBER 2020-21 MONTH.THIS FIGURE ALREADY DECLARED IN FORM 3 B IN 2019-20. AND DECLARED IN GST R 1 B TO C.BUT GST OFFICER NOTICE ISSUED IN DRC1A DIFFERENCE BETWEEN GST R 1 AND FORM 3 B. 15 DAYS GIVEN TIME FOR RESPONSE.NOW HOW CAN I REPLY.PLEASE REPLY SIR