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.
I assume that you and your wife are divorced, and that there is a court / maintenance order requiring you to pay R12,500 a month to your ex-wife as your contribution towards your children's maintenance?
If that is the case, then surely that monthly contribution covers everything: rent, food, clothing, education, etc
If I am correct in the above assumption, then NO, your ex-wife can't force you to pay a further R50,000 per year for the varsity fees.
BUT: your ex-wife could make an application to have the court / maintenance order amended to increase your monthly requirements, which would then enable the varsity fees to be paid. That won't be an easy thing to do, especially if you explain to the court that you're currently paying 50% of your salary to your ex-wife as maintenance for your children, and you don't have the financial ability to increase your payments.
At the end of the day a court will need to decide WHAT a reasonable maintenance is, taking into account your children's actual needs, but ALSO taking into account your financial ability to pay. If you can't pay more than R12,500 per month, then a court will be VERY reluctant to make an order requiring you to pay more.
My advice is to explain to your ex-wife that there is an agreement in place which regulates the payment of your monthly maintenance, and you'll stick to that agreement, but there is NO legal basis upon which she can demand further money. If she wants further money, she must go to the maintenance court!
Just make sure that you don't sign surety with the varisty, or sign as the fee payer - otherwise the varsity could just sue you for the money and you'll then need to pay it.
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,