Hi there and thank you for your question,
In terms of SA civil law, you are only legally allowed to be married to one person at a time.
So, if you want to marry another wife, you'll need to divorce your current wife first.
Otherwise, you won't be allowed to get married again civilly.
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Please note: This answer does not create an attorney-client relationship. Please consult a local attorney in person for legal advice. This information is being provided so you can better discuss legal matters with your attorney.