Mondelez India Foods / Cadbury India — Problem with Cadbury Bournvita

Today I took out the Cadbury Bournvita pack that I bought this year, when I opened the pack I saw it turned solid. I noticed that the expiry date was not there on the pack. I took out the solid bournvita and I saw some part of the bournvita turned white. It surely is something other than the contents of Cadbury bournvita as the white part was looking like powder. It's so unhygienic, It seems like the bournvita gets fungus or other.
I just want to know about the white powder that came on the product, I want the answer that what this white powder is? And where did it came from?