FNB *****

A few months back I had a ***** transaction on my credit from Flysafair which I did not authorize, I phoned FNB ***** line and disputed the transaction and canceled my credit card. Everything went well, got my reference number and a month later (after the investigation) my money was back on my credit card. Yesterday the same amount was deducted from my credit card account again without a transaction number or any SMS that it has been deducted again. I phone FNB and asked the reason, but they could not give me an answer. I was transferred to other departments for over an hour and a half. I ended up logging a dispute again, BUT I suspect that FNB deducted that amount again and it was not a transaction from Flysafair this time... I think it is still to do with the original dispute, but no one can give me any answers. Now my credit card is over the limit and they want to penalize me.