Online banking - no proof of reversed funds

Payment was made on 29/09 to a FNB credit card number (credit card account) from our Nedbank account, which credit card account was seeming closed when payment was made. Nedbank has provided us with proof that payment was transmitted to FNB, with clearing house reference etc., however FNB fails or refuses or omits to provide us with any information to indicate that the funds has been reversed to Nedbank and just informs us that the funds are not with them as the credit card account was closed. Nedbank has requested proof from FNB that these funds has been reversed so that Nedbank can track the funds, but to no avail from FNB.