Myntra.com — Got product of different brand and then the pickup was done successfully but return got on hold it failed to pass the quality chec

Website: Myntra

I have ordered Nike green and cream coloured cosmic unity basketball shoes on 9th November and i got the delivery on 14th november .as i was busy i did not open the package on the very same day..i opened the packet on 15th november and to my horror it was completely different and cheap quality product..i instantly initiated a return process and called customer service twice but still my return got cancelled so i again raises a return process request.this time my return request got initiated and my pickup was successfully done..but after 4 5 hour i got a call from myntra courier partner..and they said they will see how i get the refund..i instantly called the customer care to report the issue..but to of no use they did listen to my issue..really i got fed up as my 13495 rs has been stuck and i dont knw what to do now..why the hell on this earth i have ordered from myntra ..looks like i have got cheated..please do some help