What is the ruling on using the SABB MasterCard which deducts 5% and the remainder is paid through a Tawarruq transaction, knowing that the card is covered by the customer's account and the annual profit margin is 28.68%?

It is not permissible to settle credit card debt with a new tawarruq transaction with the bank, because that is considered a prohibited 'reversal of debt' (qalb al-dayn) and falls under the category of 'rescinding debt into debt' (fasakh al-dayn fi al-dayn), which is Islamically forbidden. Furthermore, organized tawarruq itself is prohibited.