FNB Debit Card Disputes disappoints!

I have been engaging with FNB Debit Card Disputes team since October 2019 about an issue with a transaction on my card that I disputed. After submitting the dispute form 3 times and contacting this team multiple times about the issue, I was advised on 20 December 2019 that the bank cannot assist. I assumed that the matter was closed. To my horror another transaction has gone off my account from the same merchant which has resulted in my account being overdrawn. Additionally, the bank sent me correspondence stating that the bank has not found any irregularities and the dispute has been closed. This is the worst team I've ever dealt with at FNB!!