overcharged

My contract is R89 for 2GB and I pay for calls made as well. Imagine my surprise when my data charges apart from the contact amount came to R675 for the month. I want to query this but I wait for long periods of time or get cut off when I call \customer care"and I can't get any joy via the query form on the website. So how must I resolve this issue? <br> Tell me and I will do same cos I clearly cannot get it done by myself"""