Excessive billing

<p>My contract billing use to be between R750 and R950 p.m. Since my upgrade it jumped to R1400 - R1800 p.m. On 18.07.2016 at 20:15 I recieved a sms stating that my data has run out...fine I understand. On the 20th at 07:35 when I went onto my app to load data my bill was sitiing on R2361.37 ***...When I called customer care she stated it was out of data rate. A R1000 for the day, and that is with me on WiFi for majority of the day. You guys make me sick. My wife is on MTN and has never recieved such a bill, and we are on similar packages. I refuse to pay this. They said they will investigate but it can take anything from an hour - 48 hours. I've been with Vodacom for 16 years, but that might change.</p>