Myntra.com — Wrong product given not yet refunded

I Ordered a white shirt of Moda Rapido brand from Myntra company but they have provided me with a white shirt of another brand(wrong product was given. Despite raising return and refund request Myntra company is not at all resolving my request. Since 24 th of march customer care department of myntra is telling that it will be resolved within 24 hrs but not at all resolving since last 4 days despite calling myntra customer regularly, no resolution is happening, pls take necessary action against Myntra for delivering wrong product and not resolving my issue.