Can you go to > Click Your Account > Choose Raffle > Share Screenshot.

You can see and confirm the wagering by seeing the raffle tickets. Since you said you waggering around 8,000$ you should have 8 tickets on the raffle section. I usually use these to confirm my waggering by seeing how much raffle ticket we own during weekly raffle.

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Stake having different calculation comparing to other casino. They are not providing the amount you're gonna to receive at them time we are claim like (Duelbits). Sometimes bigs, sometimes bad. That's how bonuses in stake is.