Nykaa.com — product is not delivered to me

Product is not delivered to me, when i track it says it has already delivered. I have asked for proof of delivery, and i am shocked to see my signature there which i have not at all singed.Called customer and nykaa is neglecting the issue since a month. they are not even following up with the issue. I have orderd loreal products on Aug 14th, and still didnt recieve even after complaining so many times