Wrongly Claimed IGST

one of my client have wrongly entered IGST input in 3B in the month of July 2017 amounting to RS. 1,28,000/- but didn't offset the same for the F Y 2017-18. But later during the F.Y. 2018-19 he has utilised the same and offset it with IGST, CGST and SGST. Now there is an excess amount of 68000, 25000 and 25000 IGST, CGST and SGST respectively is c/f in the month of February-19.Now I have not yet filed the returns for the month of March 2019. Shall I reverse the IGST of RS. 128000 now and discharge the interest for the same. if I do so what about the annual returns for the F Y 2017-18. how to pay IGST by reversing it. because payment option is not made for the annual returns.