Gst wrong itc figures entry

Friends, while filing GSTR 3-B & claiming ITC for July 2017, total of SGST & CGST paid on Inward Supplies i.e. Purchases (Rs.17210+17210=34420) has been wrongly entered into IGST column instead of SGST & CGST. Total SGST + CGST collected on Sales is Rs.18365+18365. Balance Tax of Rs.2310 has been paid online into State Bank of India.

Now, while viewing ledger, it shows balance  tax payable of Rs.34420/-.

What to do.

Thanks in advance.

K P