Bill not uploaded in GSTR 1

NAGA (ACCOUNTANT) (514 Points)

30 August 2019  
Sir,
One sale bill missing in GSTR 1, but show in 3B, and amount also paid
Now my query is the difference between 1 and 3B how to clarify in 9C. Is it possible to rectify in 9C.? Because customer asking the bill not updated in gst, and not reflected in GSTR 2A.