Very disappointing

Pay and clear payment made from FNB to capitec gone missing and fnb is not willing to help they keep on telling me their system shows that the payment was successful. A payment was made on the 1st of May 2022 with immediate payment from my fnb busses account to capitec and my client says nothing is reflecting on her side side till today. What is sad is that there’s actually proof of eft payment being successful but nothing on her account , this is very unfair because I had to pay her another R500 again today via Ewallet. I would like fnb to return that R500 that was paid via eft back in to my account because I have already paid that person today. I am very disappointed with fnb