You can start by checking Lyngsat site out for what's available FTA in your region, make sure the 8th column "Beam" says "South Africa".
here is a list for IS7, just for exsample:
Intelsat 7 at 68.5°E - LyngSat
{Edit} If your Dish is still aligned properly, you should be getting something with that card (I see at least "Botswana TV" is FTA)