Theft

I made a payment into the wrong account nr by accident. I contacted my bank, Capitec to try and reverse the payment. They came back to me telling me they could do nothing about it because the money had already been drawn from that account. I contacted Bidvest Bank, and they said they could do nothing about it. I said to them that it was their client and they must tell him/her to pay back the money. They said they can not do it. I asked for the customer's name and address, but because of the Poppi Act, they can't do it. I want to open a theft case but need the information to do so.