Mirraw — refund not received for products returned

Website:

Mirraw.com

I purchased 6 products from mirraw.com Out of which I received only 5. I got refund for 6th one. However I returned all the 5 products within their return policy limit. The courier company records shows that products have been returned to the mirraw wearhouse. However mirraw says that they never received it. I have called in multiple times. But mirraw team never did any investigation on where did the package go if the courier company says to they have delivered it. They conveniently say that they did not received it