One97 Communications — compensation of missing subject

I had orderd some groceries (order no [protected]) from paytm mall but one product was missing when I received. Imeadiatly I made a complain to customer care to either resend missing product or refund full amont of missing. But paytm is neither re sending nor able to refund full amount of missing product. Paytm offering only one third of missing product. I have been follow up over 1 month Paytm still stand on their decision that they will not re send missed iteam nor refund full amount of missing product. They are not explaing the reason that why Paytm can not refund full amount of missing product and not explaining the criteria on base they are refunding one third of missing product. I have complaint many times having complain no..[protected], [protected],[protected],[protected].