I'm not sure how Austrian works as far as taking a payment over the phone but the airline I worked for took all the credit card info from the holder and then punched the enter button and that is the end of it. There are times when the information given does not match what is on file with the financial institution that issued the card. Wrong address, name not spelled correctly, etc. I'm not saying that happened but if it did, the purchase would be kicked back and be seen as not completed. I was at the airport when I worked and saw this frequently. I'm sure this was an automated action so no phone agent would have seen it to call back to reconfirm the details.
Just one possible reason it could have happened.
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