App World sometimes has issues. If it persists, you can try pulling the battery on your 9300 for 30 seconds. Make sure you pull the battery while the BlackBerry is running, not turned off.
It could also be a temporary issue with Vodacom's network. South Africa is definitely one of the supported countries so you should have access.
http://www.blackberry.com/app_includ...bility_en.html