Increase in my account - Without my knowledge

Vodacom Vodacom Vodacom ....... they will always find away to add to your account without your knowledge. Well of course then you contact the accounts department and you ask them why the sudden increase on my account and they tell you oooo ..... But there were and increase added to your account. Thinking as I do well I would have thought Vodacom will at least send out communication to inform you? Well they don't, and when you ask why not they simply say sorry for that!! I think this is the last year that I will be using Vodacom as my service provider. But losing one client will not bother them because they do not strive to serve a client.