India Post — missing one packet from two packet

Website: I order item from www.myprotein.co.in

I sandeep bhardwaj.
This message is in regard for the order from uk which i received on 9th oct. Tracking number is ea[protected]nl. I have order my protein 5kg and bcaa 500gm from uk in which bcaa was missing. I dont understand how n why this happened with my order very frustated. When complete package was courier to you then why did i receive only one instead of 2 pack.