FNB IS VERY UNHELPFUL

Good day, I need some help please. My dad paid his credit card off at Fnb from nedbak account. However he selected FNB as the approved beneficiary that is already on the list and his card number as a reference. FNB has been so unhelpful on all platforms and insists that this is Nedbanks problems however it clearly shows on Nedbank side that it was paid to FNB card division. He had the same issue with ABSA who sorted this out immediately with the missing payments division. It has been 3 weeks and not the branch or online are assisting as they keep looking at his credit card for the funds.....How can the money be with nedbank when it shows it has been released. This is a complete nightmare and no help at all. They seem to think its okay to send an elderly man from bank to bank..... I'm sure people do this all the time, why is this so hard. ABSA sorted it out. Please help, we are desperate, it's alot of money for him