At Cape Town International there is:
Good Hope Flying Club:
www.ghfc.org.za tel +27 21 934 0257
Cape Aero Club:
www.capeaeroclub.co.za
Delta 200 Flying Scgool:
www.delta200.co.za (when I tried the link it didn't work for me)
There is also Stellenbosch flying club which is just outside Cape Town (30mins drive from the centre) and very beautiful scenary.
www.stelfly.co.za
Regards
GT