Myntra.com — Product declined to exchange/ return

I ordered a pair of shoes, and upon receiving immediately found that the size is small for me. While placing the order I saw that it has return and exchange process available.

I requested for an exchange immediately through the mobile app j
a matter od minutes upon receipt. The shoe wasn't used at all, I had just tried it once on my tiled floor and placed it inside the box provided as it was too tight for me.

Now this collection guy comes to receive the product for exchange and says it has a very minor stain on the sticker attached below of one of the shoes. It surprises me as in broad daylight it doesn't look like a stain to me at all.

This guy asked me if I had used the shoe outside. I explained him the same stating the shoe wasn't used more than 10 seconds before it was back to the box. He told me that he would talk to his executives and get it approved in two days but few hours later the exchange was rejected from Myntra's end.

Now for several days I have raised multiple tickets stating it has a damage/stain. Within hours they close the ticket claiming it's resolved as their investigation indicates the product was delivered in a fair condition. This frustrates me a lot, and they didn't even mind calling me to discuss about this.

I have attached multiple photos and sent to them but in vain.

Are these guys running a scam?

One guy comes and looks at the product and says it's stained and there is these whole scamsters from the back end team claiming it's not without even contacting the customer.
I have attached photos of the product. Can someone from Myntra tell me if this product looks stained? If yes or no, then it seems like your collection executive and your backend are not in the same page and contradict each other.