FNB making me pay for a Malfunction on their Banking App

Yesterday I tried to make payment on FNB Banking App to existing beneficiary and everything appeared normal until i confirmed payment but the payment history reflected that the payment went to the different beneficiary, i tried to download proof of payment but the system gave me an error and said i must try later, i then called FNB call centre and they confirmed that their system is not working as it should, they further told me that I must complete a form for them to reverse the payment at a cost of R325.50 and the process will take 7 to 10 working days, I told them that I am not willing to pay for their system cliche and cannont wait that long because the person I was paying is expecting the payment then, they offered no further help saying that is their process. I am extreemly frustrated by their lack of ownership of their problem and lack of help to assist me resolve the matter