Nykaa.com — missing product in my order

I received my order on May 2nd and it had one product missing.
The order number is: NYK[protected]
So I didn't receive one product from this and raised a complaint about it.
They said they dispatched all products. I again called customer service and they said they would re investigate about it.
Today again, I received the same email I
saying they dispatched all products.
when I called customer service again, Ms. Rakhi told me how they have footage of all products being sent to me. That basically goes on to say that I am lying for one product out of the seven or eight that were ordered.
Even when I said that I have pictures of the products I received, she went on to repeating that they have footage and pictures of how they sent all products. That basically means I am lying. Because we have nothing better to do than complain and lie about a product that they say they sent.
Very bad customer service from their end.
Awaiting a call from their supervisor as of now, but very disgusted with their quality of customer service.
This is how these online services cheat and harass us.
And I am so disappointed because I thought atleast Nykaa wasn't one of them. But sadly it is too.

I would like a strict action to be taken against this if this issue isn't resolved soon so that they don't continue to cheat consumers like this in the future.