Exorbitant out of bundle rates

I have a ****le with a 2 gig cap. Usually my dad pays not more than R200 per month. Last month I watched some movies online. This apparently amounted to just over 12 gigs of data usage. Altech Autopage automatically deducted R9000 from my dads account. They claimed that because I went over my cap I was charged R2 per mb. This is ridiculous! I know people who pay R1000 for uncapped data every month. I was given no warning that their out of bundle rates were so expensive. This ridiculous charge has impacted my family and placed a financial burden on us all. My dad is the breadwinner and he cannot afford this charge. I would greatly appreciate if this charge would be reduced. If not, I will be reviewing the original contract in terms of the Consumer Protection Act and seeking legal counsel. My claim will be based on the fact that all contracts are supposed to be drafted in clear, plain and simple language and all fees should be set out. No hidden costs, like these out of bundle rates, can ever be reasonably imposed on an innocent unsuspecting customer. I hope that this matter can be resolved.