Billing with out any explanation

I have been very long with Vodacom but never have I been this disappointed in the service. <br> <br> Each month I use around the same amount of data but suddenly my bill is over R3000. Nobody can explain to me the situation and nobody can even sent me a proper billing report to show how it came to that. I am not 24/7 on my phone and this is not what Vodacom have explained to me when I upgraded my contract. <br> <br> I will not pay before I received an explanation. <br> <br> If i could have cancelled my contract I would have, but again where they trick you in their cancellation policy.