Unauthorised Transaction on FNB Bank Account

On the 2 December 2019 Kulula debited my account with R1659.22 flight *** which I authorized. On the 2 July 2020 Kulula debited my account again with with the exact same amount and same flight number. I contacted FNB on the 3 July 2020 requesting them to reverse the transaction as I did not authorise this. They sent me a Cheque & Debit card dispute form and I forwarded it back to FNB. The ***** department refused to assist me on Saturday 4 July 2020 and advised me to stop the card. On Sat 04 July I went into the FNB Brooklyn Branch to get a new card as advised by the ***** Department. FNB told me it would take 5 days to sort out the problem. I have been trying to get the irregular amount credited to my account, as well as the bank charges, but to no avail. I did not authorise the transaction. The ***** Department insists it is not ***** even though Kulula have deducted the same amount 2x for the same flight and ticket. The second being without my consent and 7 months later. The bank today advised me to lodge a complaint. The consultant from FNB had the audacity to tell me the reason they paid the unauthorized amount is because they have to protect their client Kulula. What about protecting me whose money was taken out of my account without my consent or authorisation and am also a client of FNB? In the meantime all my debit orders were returned unpaid, I have been charged r/d fees plus my name has been tarnished and am left with a debit on my account. I would like to stress the transaction is a duplication for a ticket I paid in December 2019.