I booked a flight from Budapest to Los Angeles a while ago and got a call from customer services rep saying that although there was a confirmation email sent, I should receive another email that it is on hold. That agent then told me that flight is full, offered to help. Then told me he found two seats and will be able to help with seat selection ( albeit the flight was full a moment ago) but with addtional $400 per booked ticket. As I refused, he then offered mt me different times, dates or airline options that I already told him I and not flexible on dates. Eventually I had to tell him to cancel the booking. These websites seems to be luring people into booking looking at cheaper options and then try to overcharge them. Totally unfair business practices really close to scamming people.