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21+. Gambling Problem? Call 1-800-GAMBLER.
You can always fight the payment with Revolut by filing a chargeback.
It is likely that the merchant did not debit the reservation and let it fail which is why you saw the payment being refunded or cancelled. Then, afterwards the merchant make a correction and debit the amount 'again' but now successfully which is being shown as offline.
They charged you 300 euro for the chargebacks then? Disgusting! I hate these people. If only we could get them all closed down. I don't give a shit about the money no more I want more innocent people like ourselves to stop being targeted. Noone wants to safeguard a gambler!