Myntra.com — Return/ exchange not processed

Address:	Bangalore, Karnataka, 831004
Website:	www.myntra.com/?src=logo

Myntra-worst customer service.
I ordered a casual shoe from myntra, order number[protected] of worth 1851₹. Unfortunately the size of the shoe was too large for me and hence requested an exchange for the same. During the time of exchange the delivery boy Mr Ashok yadav, checked the product and informed me that one sole contains some dust so he won't be able to exchange the product. Since there is only one way known to mankind to judge the fitting of a shoe and that is by wearing it. I explain him that the dust particles, which were very minor got stuck during trying out one of the shoe from the pair. But he refused to take the product and asked me to contact customer care. When I conveyed the incident to the customer care they asked me to share the pics of the product. After a day I got an email from the customer care (screenshot provide below), where they declined my exchange/return request because according to them the product was used. The product has its original tag intact including one on the sole (pictures provided). I even spoke to senior authority but still they are saying that the product is used so can't take the case forward. I am totally done with myntra. No wonder flipkart is not only successful in acquiring it but is also brilliantly contaminated it with its customer repelling policies and "we are there to exploit you" type customer service team.
Feel like approaching the consumer court for justice.