Data Usage

I upgraded my cell phone contract in May 2015, and at the end of July I received an invoice for R6500. I went into Vodacom to find out what had happened as I normally only pay about R2000 per month - so I was sure that this was some sort of mistake. But sadly for me it was no mistake - this was data usage - which is absolutely impossible as I did nothing different to what I normally do. I then phoned the call centre and asked for an itemized printout if this data usage - which I was told that I would have to pay for. I agreed and waited but I never received the printout, so I called again and this time I got the printout - which really doesn't explain much. I also told them that I could not afford to pay the bill and that I wanted it queried as this amount was definitely incorrect. I was told that I could put a stop order on my Vodacom debit order payment as it was far more than I normally paid and that they would query the account. Yet on the 17 August my cell phone was cut by Vodacom and i was told to pay the full amount owing to date which was now sitting at R7830. As much as I disagreed with the amount being charged I had to pay it as I use my phone for business purposes.