wrong figures put in GSTR 1 of sep

I am liable for filing quarterly GSTR 1..I had already submitted GSTR 1 of July 2017...now return of Sep showing figures of Aug + sep was to be filed..by mistake I have SUBMITTED the GSTR 1 ( not filed only submitted ) showing figures if Sept...How it can be corrected and figures of Aug can be added there in...Here the return will be showing submitted till any action is taken by me...please guide and help...thanks