Hi @MaheshKumbhar. That sounds really frustrating.

For what it's worth, I've looked through the terms and conditions:
https://www.databricks.com/learn/certification/terms-and-conditions 

I think checking your phone during an exam probably isn't the greatest idea. Not sure if that violated one of the rules. However, I did find this:

It seems like the network issue may have caused the suspension. It does say that the fees "may" be forfeited, so it's undoubtedly worth checking if you can can the fees back for a resit.

All the best,
BS