Jeg mener, det behøver ikke at være casinoets skyld, men ikke engang din. Der er mindst 2 andre fag. Din bank og betalingsudbyderen, der sender penge til kasinoet. Sagen er, at du skal finde ud af, hvem der gjorde fejlen der, og kasinoet skal altid være villig til at samarbejde i denne sag.
I hvert fald kan du starte med din bank, fortælle dem, at pengene ikke nåede modtageren og lade dem undersøge sagen. Hvis deres forsøg på at sende pengene mislykkedes, bør de refundere dig, ellers får de et bevis på, at pengene blev sendt. I så fald kan du sende beviset til casinoet, og så skal de tale med deres betalingsudbyder. Alle transaktioner har deres eget transaktions-id, så de burde kunne finde betalingen.
Hvis det er et godt casino, så burde det være nok at sende dem for eksempel et skærmbillede fra din netbank, der viser transaktionen for at starte efterforskningen på deres side. Men du kan altid starte med din egen bank. Pengene kan ikke gå tabt.
I mean, it doesn't need to be casino's fault, but not even yours. There are 2 other subjects at least. Your bank and the payment provider that sends to money to the casino. The thing is you need to figure out who did the mistake there and the casino should always be willing to cooperate in this matter.
Anyway, you can start with your bank, tell them the money didn't reach the receiver and let them investigate. If their attempt to send the money failed, they should refund you or they'll get a proof that the money was send. It that case, you can forward the proof to the casino and then they should talk to their payment provider. All the transactions have their own transaction ID so they should be able to find the payment.
If it's a good casino, then it should be enough to send them for example a screenshot from your internet banking showing the transaction in order to start the investigation on their side. But you can always start with your own bank. The money can't get lost.