Vodacom Bill Outcry

I have a 2 year contract (with handset) with Vodacom. I am currently halfway through my contract and am counting down the days until I can cancel it. My bill for the past year has (typically) been between R800 and R900 a month. I still found this exorbitant when I was initially expecting R700 but I blame sky high data prices here in South Africa. This month I was charged R1740 for my August phone bill which prompted me to login to my online Vodacom account to see what I would be in for in September and to also find a break down of a surprisingly high bill. My September bill \so far"was R3"