Myntra.com — Rejected product return

I had ordered a pair of shoes (order no:[protected]-3968403) from Myntra on Mar 23. I received the item on Mar 24 but didn't find the quality upto my standard and issued a return. The item was picked up on the next day.
Later that day the return was put on hold so I raised an issue with the customer support. On Mar 26 I was informed my return was rejected because the item failed quality checks as it was used and the item will be reshipped .
So, I contacted the customer care helpline and asked for clarification on the issue. I was told that I'll have to accept the product and reapply for return. They couldn't provide me with details on why the quality checks failed and what issues they found.

I don't believe their claim that the item failed quality checks as I had only tried on the shoes once and found the quality of the item unsatisfactory. I had returned the item in it's packaging and original condition. The pick up agent had checked the item in front of me and found no issues as well.

I would like to raise an issue regarding the same. They have no basis to prove the the item was used and are rejecting my return and refund unfairly.