Gst itc wrongly claimed

Sir , in case  supplier has not filed gstr 1 in july month and return is filed in the month of september . Then itc is not available to receipent . However receipent has opted for qtrly return . Accordingly he can claim itc in qtr . And the receipent has not paid tax in july and is only making b2c supplies. Then in this case is receipent is  required to pay intt only or full amt as well of the july input . And also how tym for which intt. Is required to be paid