Thank you for this topic.
I used AirAsia Move and it offered me a seat on airline that I knew from that airline was no longer available... well, I was booking for 4 people in 2 separate bookings, first booking went through, but second one - that seats were gone. Air Asia Move wasn't aware, and tried to make a booking anyway. I did put in details for billing but within seconds of that I received an email that "Booking failed. You were not charged". I thought nothing of it and booked another flight, which was successful.
But just after reading this, I went to my credit card statement and realised that Air Asia charged me for both flights, and there was no refund of the first flight - basically that "you were not charged" was not a factual statement, so I could say Air Asia robbed me for 7000 baht or so.
Hence, thank you for this. Question is - now what. I've already paid the bill. Unsure bank would be interested...
EDIT: this is how their email looked like: