Disappointing service

I had money in my account which when I woke up the next morning it was gone. I went to the branch to report and fins out what happen. They told me someone might have swiped my card and done payments which means they can't reverse the money because it's a payment via POS and they can't do nothing. My biggest problem was that I didn't swipe that amount of money in the pass couple days. .I'm very disappointed with FNB.