Myntra.com — order received was different product and they refuse to change

Address: 249403

I ordered a saree from myntra. Got just different product. I raised a exchange request in exchange request i too mentioned that the product is different. When the delivery boy came he refused. I raised a request via call then gave the details via e mail. Replied them. Now after doing regular follow up they are saying it cannot be done since time is passed.
Why should i suffer because of some mistake from their vendor. I even told them the mistake that i have received invoice of some other person in that bag but they won't consider... This is the worst experience