Myntra.com — i am complaining about undelivered product claim by myntra that it is delivered

Address: Sector 3, Airoli, 400708

I have ordered 2 products from myntra (1 tshirt and 1 shoes) and both are deliverd too late.
I only received 1 product but they claimed i recieved both, whereas shoes were not delivered i raised a complaint for that but they said we can't do anything as thier record says it is delivered. I checked for the t-shirt which is also wrong product.
I talked to their customer care and they said they can't do anythinh and just sorry for the inconvenience. They said i should prove that i did not get the product, but i don't know how to prove this.