Myntra.com — returned one product and it's misplaced somewhere

Address: 560035

I had ordered items in bulk. And returned few of them. But bymistake I forgot to create return request for one item which I had already returned.
Then I called the customer care and informed them the same.
But warehouse guys denying it. They have probably misplaced it somewhere or knowingly not telling.
I have never faced this type of inconvenience with myntra.
Atleast return me the product or else refund my money.