High Charges

I took out a 2 + 2 night owl account and two 1 gig top up accounts with Vodacom. The sales person told me that it was a fixed contract and that when the data was used up it would stop. For a year this was fine. Until January 2016. Suddenly the amount per month went from R279 to R1209.50 In February. When I asked why I was told this was an open line account and that I was using out of bundle data. I was told by the sales person that this would not happen. I see now that the current month is near R4000.00. I asked the accounts department to phone me as you cannot phone them, you can only get through to customer care, to negotiate terms. I am still waiting for a response.