Unhappy loyal custmer

My account balance for August was absolutely outrageous. Normally my bill comes to just over R2000 on a XL smart deal every month. I did nothing different on my phone for the month of August and my bill came to R4880, I looked into it and my data amount was over R2500 on its own. I phoned the Vodacom customer care to query the amount and they said that they will not be able to send me a data spreadsheet when I used my data. I logged a call with their technical department reference number S3-8GS27-7GYWK and they said it will take 48 hours to get back to me. It has been five days and I have still not heard anything. <br> I then put a limit on my phone that if my monthly 800mb finishes and my 400 minutes Finnish that they soft block my account for the month of September. Vodacom has already blocked my account so I asked if they can add an additional 1 GB for R149 and R200 airtime which they did. It has been three days apparently all my data and airtime is finished. I went onto my phones data usage settings and my phone states that from the 1st September till today, I have only used 784MB (note I get 800mb a month) and I did not make any outgoing calls. Please tell me how this is possible