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 as you like until you are 100% satisfied.
Initially, my advice was that if you agreed on the figure of R10,000 per month then that is what you should be paid, but I then changed my mind because I realised that you had thereafter signed an actual employment contract.
In that instance, the employment contract sets out the agreement that was reached. The "oral agreement" no longer applies, as it was merely discussions which were entered into with a view to signing your written employment contract.
In my opinion you are entitled to rely on whatever is recorded in writing in your employment contract.
What makes the companies case bad for them is that if the employment contract was issued in error, they should have IMMEDIATELY given you the "correct" version. They didn't do this, so essentially they are bound to the terms of the employment contract which you signed.
You should therefore be paid whatever is recorded in your existing employment contract.
If HR wants you to sign a new employment contract with a lower figure, you should refuse, on the basis that they are illegally reducing your salary.
If you have a dispute, put it in writing to the HR department. If they don't resolve it, then you can refer the dispute to the CCMA - who will then decide!
If my answer hasn't answered all of your questions, 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,