Myntra.com — delivered a detected product, not returning it

I ordered RayBan sunglasses worth Rs 6685 on Myntra. They deliver me a defected product. And now when i have shared all the pictures and details of the product, they are still not giving me any resolution. Everyday i call the customer care and mail them, they will say the same thing that wait for 24hours and you are will receive a call back from our manager. To this date, neither have i received a resolution nor any call back. Instead i call them and mail them everyday asking for the status. All they say is that we are working on it and will give you the resolution within next 24 hours. Please help me here as my money is stuck here and i do not know what to do with it.