Myntra.com — Return dress

I had ordered a miss chase black tshirt dress and now i want to return it because it did not come with a belt. But in the product details it was told that it would come with a belt. Now the courier service is not taking back the product because the belt is missing. How can i return the belt when i did not receive it only? I want to return the product and want the refund to be credited very soon. I had requested myntra for a return on the day i got the product delivered. So i want myntra to take steps as soon as possible. And also want my money to be refunded.