I registered for MTN's loyalty points system and racked up 1800 or so points over the last few weeks. I then transferred 1500 to my wife. A day or so later, when checking my bill on 16202, I suddenly got a bill for over R1200.
Phoning MTN confirmed that they have a problem where points are seen as cash and they are looking into it. They did say that hopefully it will be resolved before my debit order kicks in and relieves me of my cash!
Lesson: don't transfer loyalty points! You will unknowingly support the governments Reconstruction and Development Programme!