Delhivery — Misplaced of products

There is a return to the merchant. I gave two pairs of shoes to the delivery agent. He didn't say a thing about, how many should be taken. But they return only one pair of shoes to the merchant. After that, I raised many emails, chats, and calls on demand. but they are not replying to issues accordingly. On the website, I said that to give me the proof of submission. but they are not giving it and said to revert to the merchant.