Hi there and thank you for your question,
I will try to assist you with your legal question but please feel free to ask as many follow up questions in order to clarify your initial question. If you have a new question, you must please open a new thread.
Unfortunately no, your ANC is not legal, and the effect is that you are in fact married IN community of property, and not OUT of community of property.
You are still married though ...
What you can do is to apply to the High Court to have a post-nuptial contract registered which will then change your marriage regime from IN community of property to OUT of community of property. It is unfortunately costly since you will need to brief an advocate to appear in court, and you will need to advertise the application in the newspapers. You will also need to give a copy of the application to anyone that you own money to. e.g. banks, Vodacom, landlord, etc.
If my answer hasn't provided you with enough clarity regarding your initial question, please send me a REPLY with follow up questions so that I can continue to assist you in this same thread for as long as you need. Let me know if you need more advice - don't just rate my answer as "bad".
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Good luck and best regards,