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.
Yes, you are entitled to receive the keys and vacant occupation of the property on date of transfer. As soon as you are the registered owner of the property, you can receive possession/occupation of the property. This means that the transfer has to first be registered at the Deeds Office.
If the seller doesn't give you vacant occupation (i.e. there is a tenant, or the seller refuses to move out) then it is a breach of the agreement and you can sue the seller for damages.
You might also need to evict the occupants from the property by using a PIE Eviction application. You should be warned that you will need to use an attorney for that, and it might cost upwards of R10,000 - but you can recover those costs from the seller as part of your damages.
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 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,