Horrible Service: Disputed Transaction Handling

On 23 September 2021 I did a failed air ticket purchase online, and R23,000 was deducted from my credit card (ticket purchase failed!). I contacted the airline and they advised me to talk to my banker - FNB! I did just that, then l logged a dispute via the app. Then l alerted my personal banker, then l have been making follow up calls - l still have no joy! I am out of pocket that much, and l need my money back. Why can't l just get the service that l am paying for? Your charges are not pocket change FNB!!!!!