Myntra.com — Didn't accept my self shipped item

After I placed a return request for my jeans, I was asked to self ship the item to their returns processing facility. I followed all the instructions given by them and shipped the order accordingly which cost me ₹450.
However, when the product reached their processing facility, they refused to accept it sent it back to me. Now I'm at a loss of ₹450 and that is excluding the jeans(costing ₹2, 151) which doesn't fit me and Myntra refuses to accept.