Still awaiting refund

Still awaiting my refund, I have been following up since August 2021.

I incorrectly made a payment of R6000 for rent to SEEFF properties, in Cape Town. I made this payment in Aug/Sep 2020. The payment was incorrect because I was not living there anymore. I sent them the information and notified them of the error that I had done. A lady by the name of Janine Adkins is the one who I've been in contact with, via email. She told me that I will not be able to receive my refund as the previous tenant of that flat, the one who used to live there in 2020, has not yet paid them. So, because that tenant hasn't paid them I've been told that I cannot receive my refund. I shouldn't be held liable for another tenant's inability to pay. I don't know this person from a bar of soap.

I need someone to please help me make sense of this.

I have sent emails following up and I still haven't received anything yet till this day.