After the introduction of Jio, many providers are coming up with plans to lure customers. People usually leave a network and go to networks with better plans. It is a fact that Airtel has better plans for corporate employees. You can checkout the offers section for latest offers. Getting to know Vodafone's latest offers is also very difficult. However, customers are now leaving Vodafone not just because of lack of good plans, but also because of their customer care, policies and their software.

If you go to the Airtel website or do a quick google search, you can see the page http://www.airtel.in/apple/ with 10GB per month offer for iPhone 7 and iPhone 7 plus. However, if you go through the links and see the date, offer has expired far before (almost 6 months back).

Last two lines of the T&C states that offer is expired and Airtel can do whatever they want (including continue the offer?)