Nykaa — cheap product was delivered and they are rejecting the return and refund of amount

Address:

Hyderabad, Andhra Pradesh, 500090

I bought a product of nightdress set through nykaa.com, after getting, it was a very cheap quality i have seen ever so i requested refund but they rejected it, even in any other online shopping websites there will be return and refund for that product, i called customer care so many times, they ll be telling that send ur problem through mail, after sending they'll immediately reply me as it cannot be processed it was rejected, i'm fed with this, please help me to get my refund back