I am quite happy with my Cell C deal as is - I really don't feel like using matchsticks to keep my eyes open between midnight and 05.00am just so I can use my data....aka Vodasum
problem is, some of us do work at 0200 in the morning on projects, and some of us do notice how incredibly quiet the CellC network is at this time (thus no additional strain on already paid for backhaul bandwidth just sitting idle), and some of us are considering switching to the Vodacom deal for future needs because of this.
so yes, an amicable response for nighttime bandwidth from CellC will be in good strategy. I dont expect it will take them too long. And if they really crunch their numbers, they could offer shaped, torrent blocked, uncapped at these hours without causing problems on their network IMHO - even if at additional cost to me.