Myntra.com — I'm complaining about the order didn't deliver but Myntra claims as it's delivered

Address:

India

I have ordered 6 items from Myntra
One got delivered one day
One got delivered other day and claimed as all the five have been delivered.
I have been super busy and couldn't check the messages but when I checked the status in the Myntra app it says everything was delivered
When I reached out to the customer service department they tell me that there is a proof of signature and I have no idea who's signature is that.
They can't refund me nor deliver the items