Have you tried setting the following line in your web config to your specific culture:

<globalization culture="en-GB" uiCulture="en" requestEncoding="UTF-8" responseEncoding="UTF-8" fileEncoding="UTF-8" />

Replace with the proper localization tag for South Africa.

Wherever the cart displays prices or amounts we use the currency formatting "{0:c}" on the amount which in dot net is the way to format currency to work with the built in localization features dot net offers. I want to take advantage of all the functionality of dot net localization and don’t want to hard code the currency symbol all over the cart based on the country or currency the admin has chosen in the cart settings. From everything I have read about localization the cart is formatting currency properly using "{0:c}" and if you have configured your server, asp.net application, web config and database for your specific local the proper currency symbol should be displayed.

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At your service,
Dave Smith

Thanks