I know of 6-8 people this has happened to. One such situation was the purchase of a one way flight from Hong Kong to Russia on the same day, under a Russian sounding name (fake) and they flew within 2hrs of making the booking. They could build in a 2 factor authentication on any purchases, including a flight purchase - if the surname doesn't match the account holder, why isn't the account holder asked to confirm?
In this instance, due to the amount stolen/hacked, a police report was required before Qantas would investigate as well as a stat dec.. This all look a LOT of time let me tell you!!
I've also had a few friends/family members have points taken to buy multiple iTunes vouchers.
Really frustrating..!