R1500 Contact but a R10 000 bill!!

I am a VIP RED subscriber for the R1500 package and was billed a BIG R9300 for data used in less than 1 month and been told it was because of Facebook ! How is it that Vodacom allow a R1500 subscription go to R10 000 ?? Further more i was promised that they will reduce it to about R4000 witch is still bubble that i have subscribed for but still took the full amount that i was billed for!!<br> <br> Is this how they make money out of there customers?? How can they do something like that. What is the use of the affordability check when they can just explode an account like this?? I am sure this is very very wrong and that i am not the only customer been ********** like this.