Myntra.com — didn't received the product

Address: Survey No.17/9-B, Maruthi Chambers, Ground & 1st Floor, Annexe, Roopena Agrahara, Bommanahalli Bommanahalli Bangalore Urban District Karnataka India - 560068, 794111

I ordered one roadster women olive green solid puffer jacket but before delivery of the product it was marked as delivered. And also when complain to customer care they said they cannot help as it was already delivered and they cannot resolve as i was late for 5 days to give complain. As when taking down the track no. Also it was not showing before the date and when complain it showed on 20 dec 2019 whereas it was to be delivered on 6th dec 2019. I have confirmed with the post too but they cannot track the item.