Myntra - Received a completely different product of different brand

I ordered a Fable Street brand coat, of around ₹ **** from Myntra on Tuesday **th December ****, and I was delivered the product on **th December ****, on arrival my package was tampered and was covered with tapes around it, thinking it as a part of packaging I opened my package to witness a coat of completely different brand with another brand and price tag. I immediately raised a return request for the product with all the necessary documents attached to it, the pictures of the product that I received, the price tag everything only to be replied that my request was declined, I made another request with Myntra but again they declined my request, I also called the customer care around * times but they were very unprofessional and rude while on call, one customer even hung up my call while I was informing him about my product. None during the entire chats and calls helped me to resolve my query I have paid a huge amount to which I've received nothing as compared.
I'm so disappointed and disturbed at this particular moment.
Please help.