Incorrect Billing on Account

With a big surprise I saw this morning that R3635.30 was deducted from my account for Vodacom cell phone account.<br> <br> We have 2 cell phones with Vodacom and a 3G data bundle.<br> <br> I phoned the customer service number, and the Lady assist me very well. I am just upset as she told me that the 3G data number is an open line? When we first took that contract on 05 July 2012 we said we only want it to be a data number and when the data is finished nothing should be allowed on that nr. <br> <br> We did not get warning messages that the data was finishing up, or that the account limit has been exceeded. We hardly ever use the data and if we do it is for quick banking or scrolling down on FB, But this month at has reached R 2597.30 and the previous month R 573.08.<br> <br> Since 2012 we NEVER had a problem with that account now all of a sudden there is this huge bill starring us in the face.<br> <br> It is unacceptable and she now wants me to sort it out with the store?Obviously the lady that helped us then will not remember or not even be working there anymore.We will not take out top-up contract phones if we can afford to pay on open lines?<br> <br> It is unacceptable and I am very unhappy that this was allowed<br> <br>