Myntra.com — Refund Not Received though product is returned sccessfully

I ordered a zaptop heels shoes
from myntra Size was large for me so i placed a request for return.
Return was picked up successful but I received a message in the evening and they are saying that quality check is not passed, Mrp tag is missing.
There was no tag avaialble in that cardborad box in which shoes came up.
I returened the shoes same way as they were because size was large for me.Only wrappers and bill was available.I am not aware which tag they are asking when it was not availablein the packaging itself.