Amazon India — oneplus 6 wrong product delivered

Address:

Mumbai City, Maharashtra, 400093

Hello,
My name is subhash yadav.
Amazon india has delivered me wrong product although they took the entire amount for the product.
I ordered oneplus 6 cell 8gb and 128 gb memory and they delivered me 6gb and 64 gb memory variant.
Customer care people are not at all bother for the same. And they dont reply to the queries.
When asked for the solution they said to wait for a week and they cannot help in before that.
Such a way of behavior was not accepted from company like amazon india.
They have given some third party person authority to raise the complain and look. Non from amazon is involved in this issue.
Seems lost many things here.