Myntra.com — not accepting return and refund is not initiated

I had ordered few home decor products from myntra.com which all were pathatic and worthless. I had returned those products for which refund is still not initiated. One of the product among those was table lamp for which we just received top and didn’t receive lamp (Bottom piece) for which they are not initiating return process even after multiple complaints raised to them. Can you please help to resolve this issue.