Poor Customer Service

I have never been so disappointed with a brand i have used for 17 years- I got charge for Dec and Jan end of last month and when getting my upgrade and change of ownership in Dec no one told me i would get double charged. To top it off they charged me another R900 for an auto purchase top up- no where have i signed for this or was notified. It has been over two weeks and still no feedback from Vodacom- absolutely appalling service when i went into Vodacom in Sandton City to try resolve the matter- a kind lady tried to help and called the finance department however they even hung up the phone, i then spoke to the manager and she couldn't have been bother and after i explained to her what the issue was she told me she could not help and then asked me if she could leave as there was nothing she could do. It is actually *****ing if you charge someone for something they are unaware of or haven't signed for.