Outrageous out of bundle charges!

I have been charged a ridiculous amount of money for my cellphone on my account because I went out of bundle on my data. I cannot understand how Vodacom can charge a customer R1000 for 1 gig data in this day and age!!!! This was an error on my part but it still does not justify that Vodacom is abusing the situation with ridiculous charges. You can buy data from them for R149 for a gig while loyal contract clients are charged R1000 when they are out of bundle SERIOUSLY!!!! Over 3 days my data alone came to R5510. The one day I was online for about 15 minutes and they charged me 3880,14 !!!!! What for I don't know! All they tell you when you ask them is that the charges are different when you have a contract! To top it all they gave me a faulty device when I did my upgrade so now I'm sitting without a phone and a huge bill!! Seriously thinking of changing my service provider! <br>