To anyone connecting to this plan for the first time I suggest following step 3 of cell c rep's advice in
this thread. I didn't register the sim via the app when I got it last night. I'm out of coverage area by less than a kilometre, and I thought meh, I'm stuck with 2mbps down. Then loadshedding at 8pm and it was completely offline (using galaxy a3 to connect btw). It never connected again after loadshedding ended. I read that thread just now and decided to register via app. Now it's giving me 20mbps down. Maybe coincidence, but try registering it.
Hope it gives me enough speed to stream the Formula One this weekend.