VODACOM CHARGES EXCESSIVE

I woke up this morning to find out that Vodacom tried debiting R2, 800.00 from my account. I have two small contracts with them and to my shock and horror, I was totally alarmed at this astronomical bill because my bill is normally R600.00. For some very odd reason, Vodacom tells me that I used \data\"amounting to R2,000 in February? Here's the mystery...the sim card that supposedly used this amount of data (insane amount) was in a tablet, that sits in a draw, that is not even on? How on earth does Vodacom get away with this? The worst part of all of this is that I was actually the main lead in the last Vodacom Ad (Summer days are happy days) and yet, I'm being ****** by Vodacom? I'm so so so DISAPPOINTED and actually hate the brand. Strangely enough, last month, they deducted R1, 900 from my account and as much as I thought this was over the roof, I paid it...but I refuse to go through this again. I'm being ****** and it's not on."