Request for a refund

I've been granted a loan by Capitec Bank some years ago , of which later I failed to repay. I app**** to be placed under debt review, subsequently Capitec handed me over to the debt collectors. Last year I was offered a settlement discount by the debt collector of which I accepted and ma de a full settlement of that account on the 19 November 2022. The next day a debit order was made of R425 was made to pay the account. When I claimed back the money , both Capitec Bank and debt collectors claimed that they did not receive the money .