Myntra.com — myntra not giving an option of exchanging a product as insider points got collected wrongly.

Product got delivered on 26th december. However mistakenly insider points got collected. When contacted customer support they were not willing to help on this as they stated that they cannot help and can do anything from our end with the wrong sized product. Neither refund was initiated nor exchange of the product was triggered over the app. Need this concern sorted out. If proper concern is not taken need a escalation of the same.