Amazon India — Havent received the Product but its showing delivered.

I ordered a product from Amazon, part of which is showing delivered in the app but I haven’t received it. After complaining to Amazon about the same, they first asked me to wait for 5 days. I waited for 10 days and then again called them for the same. They told me that they will investigate on the matter and asked me to wait for 5 days. Again I waited for 10 days after which I called them only to hear that it’s showing them that product has been delivered. They asked me to take any outside step we want but they won’t help us from Amazon’s side.