Amazon India — incomplete delivery of my order

I had placed an order on march 8 2020 for quantity 8 whereas the delivery person delivered only 2 of them and took my signatures saying that other things will be coming in few minutes. But he never came back. I have tried to raise a complaint with amazon india. But they refuse to resolve this matter since 2 months. They ask me to escalate it if needed but they fail to raise a complaint. My order number is[protected]