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.
You really need to go back to your original agreement. What was that? Was it that his salary would be paid into your account and that you would pay everything (e.g. rent, food, etc) and then give him some spending money? Or what?
He can't simply claim your entire saving account if that's what you're asking.
His BEST claim would be that you refund his salary for March April and June. But you would have a counterclaim to say that you must first deduct the expenses incurred.
Also, you would have damages since you would need to carry on paying rental even though he left.
If you have his textbooks and other stuff, my advice is to return them.
If you don't have his stuff, put it in writing and send him the letter.
I don't think that you need an attorney at the moment to assist. You should be able to write back to him to explain what I've said above, but if you do need an attorney you can find one here: www.southafricanlawyer.co.za
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,