Frozen funds

On the 20th of February 2018, I received a sum of R5000 from Miss Mntambo which was part of a stokvel,we had never met only communicated via calls and messages. A few hours later the money had been frozen from my account because she apparently called to reverse it ,I do not know what her argument was because no one ever called me . I went to the branch with proof to show them that this lady and I were communicating and I was expecting this money ,she even sent a message to advise me she had done the transfer,I gave them all the proof and they called her ,she apparently hung up when she learnt that the consultant had the messages that we were sending each other. The consultant then told me there’s nothing she can do on her end and told me about Forensic processes and all .

It has been for long years ,the money still reflects in my account meaning it now belongs to Capitec as Miss Mntambo seemingly never communicated with neither them or me after that . I feel like this is a **** of the highest note ,why is Capitec benefiting in money that does not belong to them? It’s not being released for my use and the sender didn’t win in trying to reverse it, what now ?