It is specifically mentioned in filing section that once submitted no changes can be made.
You cannot file return without offsetting liabilities.
You need to pay the tax, offset liability and then file your return.
In case return is not filed than late filing fee of 100 Rs. per day will be applicable.
Anyhow you can provide correct details in normal returns such as GSTR-1, GSTR-3 and get the input back.