If you looking for sympathy, you not going to get it here. If you knew you were going to abuse the account, you should have offered to purchase an account that was suited to your needs beforehand. You effectively ripped off the ISP by going overboard and now you are complaining that you aren't offered any other options.
I agree uncapped should be uncapped yes, but unless Telkom leads the way, the hands of ISP's are tied. Im not for one second saying these guys don't make money, but surely if you paying R300 a month and downloading 700gigs, they are going to make a huge huge loss. Im very sure I did about 200 gigs this month and I've heard no complaints.
I've changed my approach to downloading. When looking at big files, I ask myself whether I really am going to watch it/use it, and if I don't need it, I don't bother downloading it. People seem to add items to their queue for the sake of it. We've learnt with OW that having big downloaders is simply not sustainable. Nothing has changed..