We have Purchased material from Supplier in the month of April 2019. he has not filed the GSTR-1. i have sent lots of reminder, phone call but he is not responding to us. yesterday he clears told to us. he will not file the GSTR-1.he want to close his full business. in case what to do how to adjust IGST input in books and how to adjust the itc in return. Kindly advise