Vodacom stole my money!!

7days ago I bought 3GB for 30days, but I only used 1.178GB up until last night 8pm. Suddenly I get messages saying my data bundle is depleted!! I have screendumps for everyday's usage so don't mess with me, Vodacom!! You stole 1.82GB from me and I want it returned immediately. My usage for each day since my new bundle 7days ago is as follows: 400+155+111+212+85+143+72=1.178GB. Can you see how impossible it is to use up 3GB in 7days?! My other voda**** phone also zero'd, but returned to normal after 15 minutes or so. It is only this one that is still on zero. I am absolutely livid as I do my business from this phone and Vodacom cut me off right in the middle of work last night!! I am up for renewal of my contract on the other phone and the outcome here will indicate whether I will be staying with voda**** or not. I loathe your business ethics. Get it sorted out and return what you stole from me.....I have work to do!!!!!!!!!!!!!