Not surprisingly to me Vodafone officially tops the list of most complained about mobile phone companies.

http://www.theguardian.com/money/2015/may/12/vodafone-tops-list-of-most-complained-about-mobile-sevices

 

Here is an example of my dealings with Vodafone.

https://stevenhemmings.com/is-vodafone-the-worlds-worst-big-business-corporation