Out of databundle data scare

<p>I have 1 Gig contract for about 2 years of which I upgraded last year in November, before the upgrade, once my Gig was up, out of bundle rates never app**** and I would have to top up which suited me perfectly as I'm not using that sim. Since the upgrade, to my shock and suprise I was billed R1 660 for December and already over R1 024 for January since I was not informed or made unaware that out of data usage suddenly kicked in with no limits. Since when did this come into place and why was I not informed about it. It's Janaury and my wallet is crying, I'm not impressed!</p>