No Network

Location/place: Pune

Name of company/service: Vodafone

Since afternoon, my Vodafone connection is showing ‘no network’. Since the last 6 hours, I am facing this problem. My other friends who are using Vodafone are also facing this problem today. When we went to Vodafone store in Bavdhan, the staff did not have any answer. why vodafone, why?
If this problem was likely to happen, why did you not give us a prior notice