Wrongly paid in gstr 3b

Dear Sir,

I was filling GSTR 3B for month of September 2017 and made huge mistake.

For GSTN- XYZ I have entered turnover of 7.50 lac actually it has Rs 0 (zero) for sep 2017.

For Rs 7.50 lac turnover I have paid challan of tax 18% with Rs 135000 and offset the liability.

Thenafter submit the return without filling it.

Is there any provision to rectfy my mistake or it can be adjusted in next month as I submit the turnover of 7.5lac which is not correct.

I have not filed this GSTR 3B till today.

Please suggest what to do for now.