THEFT - Unwarranted data charges

I normally have 3 contracts running at the same time, but when the time came to cancel or renew a contract last month I chose to cancel it to cut costs, I usually pay around R1750p/m for all three, so I was eager to now pay a smaller monthly fee to the massive corporate beast that is Vodacom, imagine my surprise when I receive a bill for just under R4k!!!! ***?<br> I then called an exceptionally wellspoken and helpful lady on 2/6/15 @ 11h29 and explained my situation, she then tells me I have almost R2k in data charges which is not possible, I an INCREDIBLY wary of data charges as this is where Vodacom makes their money, I have every app switched to only use WiFi and my phone itself, whenever I receive a notification telling me that I am running low on data I immediately load another bundle so I am not caught out, I checked my phone and I did not use more than any other month so I find it straight up impossible that I used that data, now Vodacom has of course debited that money, even though I have called them TWICE to limit my account in the past year but I am never listened too, now Vodacom has taken money in my account for my groceries and car leaving me broke and hungry.....