I have raised invoice of Rs. 150000 + GST on 31st July 2017. Both ( me and client) are registered in Delhi. At time of invoicing he confirmed place of supply is Haryana . therefore i raised invoice with IGST. here i also have paid IGST to Govt and Filed GTR 1 for the month of July. but now client saying that he has not been registered in Haryana so he needs revise invoice with CGST and SGST. Still he does not consider in own books of accounts and showing us as advance payment. As today what should i do? so that we can resolve this problem. please suggest it is so urgent.