FNB - duplications

I was in a recent unpleasant situation with FNB. I somehow ended up with multiple duplicate transactions on my Credit Card. All of these duplicate transactions were from different vendors. When I contacted FNB about the situation they stated I had to full out multiple forms to lodge these transactions as duplicates, so they could then investigate them and then do what was required. Seeing how many duplicates there were and since they were from multiple different vendors, I refused to do so, as clearly there was a fault on FNB's side. After multiple phone calls and then eventually having to become a tyrant over the phone, they eventually reversed the transactions. When I wanted to know what had happened exactly, they stated that the vendors (Over 5 of them) MIGHT have duplicated these transactions. I'm not sure what they mean by "MIGHT", if their system is so shocking that they can't tell if a vendor has logged multiple transactions for the same amount to the same credit card, then clearly… they have a big problem... Now… I'm pretty sure their system created these duplication's and they did not want to disclose the fault they have. The reason I’m sharing this story is it looks like I may have duplicate transactions yet again. If you are with FNB please double check your credit card statements, it looks like they MIGHT...(really guys) have an issue in their system resulting in duplicating transactions you are not aware of. I have reported them to the correct institutions, hopefully they will be investigated.