Fustrated customer

I have upgraded my phone to the Sony Experia and I have been managing my DATA, as I do every month as I have a budget to work on, however I was required to opt whether I want an update and I said no and my phone done it automatically. It had taken 650 MB at once and I was told it is not vodacom's problem. I cannot be loosing MB like I did, as a matter of fact everything that needs to be done or accessed on my phone required MB, so as it is I had to now loose so much which is not the first time and which is out of my budget. The last time I lost 1GB.<br> I am with this service provider for 8 years now and I am waiting for my contract to end so I can change to another provider who will give me better service.