15 October 2020
If the aggregate ITC for the month from all suppliers is Rs.100 and the ITC value of that particular supplier' invoice is Rs.10 who [only among others] did not file the return. You can take ITC of Rs.99 (Rs.90 x 10% + Rs.90).
15 October 2020
Yes, you can consider all invoices appearing in your 2A upto 19th september and then apply rule 36(4) which allows maximum credit of 110% of the GST amount appearing in your GSTR2A.