A R4000 increase in data cost

I have been on the same 3g data package for a number of years. I have (in what I think is almost 10 years) never exceeded the package amount of R100 per month. This month Vodacom has taken, by debit order , more than R4000 for data cost on the 3g card. I have not done anything different this month to any of the past months/ years. <br> When I finally got through to a human being at the 082111 \help"desk I was instructed to write an email to no-one in particular - which I did. I received a reply from Fhulu (no surname"