Nedbank erroneous claming of cross border fee for local transaction,

Good day. I have the following problem with Nedbank. Last year a flight ticket was bought for me by my travel agent with my Nedbank debit card at the Johannesburg office of Turkish airways. She assured me that it was a local transaction. However an amount of R297.35 was claimed for a cross border fee by Nedbank. After a long struggle with Nedbank they admitted that it was an error and they refunded the money. In January 2025 my plans changed and the original flight ticket was cancelled and a new flight reservation was made at Turkish airways at Johannesburg. Again Nedbank claimed a cross border fee for the transaction, After several Emails to Mr Isaac Rapuleng, dispute manager at Nedbank, who managed the complaint last year, as well as mails and phone calls to Clientfeedback Nedbank I have not received any response. Nobody I knows have to pay this erroneous cross border fee for flight tickets, so I want to know why it happens with payments made with my Nedbank card.