Myntra.com — no return/refund/exchange received against a defective product

I had ordered a apparel on
Date: 23/12/2019
Order no:[protected]-6376801
Product: sassafras women burgundy solid open front jacket (Provided with a belt)
Size: large
Received: 27/12/2019
Status: sealed, un-tampered & unopened
Complaint: the belt of the item was missing and hence not fitting properly. Hence requested return/refund/exchange.
Company feedback: even after registering the same issue with them thrice they did not own up their mistake, resolve the issue and denied any solution. They did not even try to give an exchange for the defective product.
As a customer i feel cheated and insulted because i lost my money as well as received a defective product which i cannot use.
Hoping for kind cooperation and redressal regarding the same.
Thanks & regards