GSTR1 Wrong Filling Due to Technical Error - Goods and Services Tax - GST

For Year 2020-2021 My Client Has Issues Invoice Under IGST Party Is Also Belongs To Other State But While Filling GSTR-1 Due To Technical Error Some Invoices Are Filed Under SGST/CGST Head However In 3B return The Correct Amount Is Showing (Without Error) Now Tax Officer Wants To Ignore Error Any What Us To Pay Difference Don't Want To Refund Excess Amount. Help !!!