Still awaiting info where a payment went into

As an existing customer I called them to ask for a confirmation of the bank account details, belonging to a public account, of another entity, for which I had made a payment into. You see, the proof of payment from Discovery Bank does not show that information. I called on Tuesday to ask for written confirmation of the same, I was promised I’d get the confirmation which I could then pass on to the other creditor, in order for them to can locate the payment on their end. I am surprised it hae taken this long for Discovery Bank to attend to such a simple request, surely they have the information readily available. Puzzling situation