Myntra.com — Quality check issue and refund

I had ordered a dressberry product and due to size issues I had to return it on the same day, with all the tags due attached to it, in the same box and same cover.
Now on after a week later they are telling me that it didn't pass quality check for some reason like maybe it was used or didn't have tags attached to it, which is absolutely rubbish.How can I use a product within hours and return it and that too with tags attached to it?