OK I called, and this is what happened
first i spent 15 minutes on hold, which is to be expected, when I got through to Tshepo I was told that the usage is unreasonable, when I asked how can I get back to the network, he said I must pay for more bandwith. They will not charge for the amount I used but said I must buy more bandwith and I will be back on the network with unthrottled speeds till I go over what I bought. I then asked "so if I buy a gigabyte now, get back on the network and use that gigabyte by this afternoon how much will I be able to download when I am capped" his answer was "there is no limit"
I asked why is there a limit now then, he didn't know. I told him I wasn't going to pay anything and that I demand to be back on the network because I didn't sign anything liek this in my contract, he said "errrrm". I then asked to be put through to someone with authority, he had me on hold for 5 minutes, came back to tell me to hold again, another 3 minutes passed, he came back and said hold yet again because he was getting in touch with shaun green, 2 minutes later he came back to say he couldn't contact him and that I must phone him, so I did, my phone said I was put on call waiting and about 30 seconds later I was put through to his voice mail.
this isn't over, I will call again and again untill they put me back at no charge. As far as I'm concerned they should give me a GB for free for my inconvenice