GSTR3B PROBLEM

In month of August at the time of return filling sales amount wrongly entered twice in B2C, GSTR1 is still pending quarterly. For Example, My actual Sales Tax was CGST 5000.00 and SGST 5000.00 but wrongly entered 10000.00 instead of 5000.00 I already filed September GSTR3B. What will I do now? Waiting for reply.