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.
In this instance you need to get your husband to tell this lady that he is not interested in having a relationship with her anymore. If he can do that, and this lady still harasses you, then you can apply to court to interdict her from contacting you and your husband.
If your husband WON'T tell this lady to go away, then you might be able to sue the lady for Alienation of Affection.
You can read up here more about alienation of affection claims: http://www.divorcelaws.co.za/adultery-law.html
You should get an attorney to write a letter to this lady explaining that if she doesn't leave you alone then you will sue her!
I am afraid that I am not allowed to refer you to a specific attorney, however I can suggest that you can locate a suitably qualified attorney in your area who will be able to assist you with your query at www.southafricanlawyer.co.za
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 - dont just rate my answer as "bad".
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Good luck and best regards,