Myntra.com — [protected]-3717601 (biba charcoal grey and beige 3-piece set)

I prepaid for 3-piece set (3000/-) but i received only 1-piece on delivery (Incomplete set).
What proof is required for such incomplete and wrong deliveries, the onus to prove is on customer alone? Am suffering loss of 3000 rs.
I have raised this issue, but have been told that package was delivered intact and quality check has been done. However i am the bearer of the loss and am still waiting for my refund or replacement for incomplete delivery.