Amazon India — Missing Item in the package

I ordered some Portico bedsheets from Amazon on 6 th June. The expected delivery date was 10 th June. I received the package and an item was missing from the package and the package was loosely packed. I contacted Amazon on the same day and raised my concerns. The Amazon agent asked me to wait till 17 th June as they have escalated the matter and looking into it. I contacted them on 17 th June and the agent said that they have a delivery scan and it shows all the items are delivered. I requested her to share the scan as I am not convinced with their answers and would like to see the proof. The agent said that the scan is only for internal use and cannot to be shared. So basically telling to forget about it !!
I requested if I can be connected to a point of escalation and she told me that she is talking to the highest point of escalation. And said she can’t help me with anything nor can share the scan and she is closing the chat and just closed the chat. That is so RUDE!!