The screenshot shows the btc address where to put the coins.. Why do you say that a different address was generated?
The screenshots of your conservations do not help here... So can you tell why you call the player a scammer? How did he try to scam you?
edit:
I tried something on your site and saw that it is pretty easy to change the displayed address
https://prnt.sc/g79zbkMaybe you should change it that your site signs the bet address.. then it can be confirmed a lot better
How did you do that Even your website have the same issue.
First of all, chain-bet is not my website.. I just played there a few times.
The difference between chain-bet and your site is, that chain-bet moves the bet amount from the generated address to their hot wallet. So every player can verify that a bet amount was placed to their wallet and not a different address not belonging to chain-bet. At your site i can only see the coins on the generated address but no one knows your hot wallet.
So if you don't want to move the coins to your hot wallet, I would recommend that you sign the bet address with PGP so people can check if the generated address is yours.. Here is an article how to do that
https://libraryfreedomproject.org/how-to-pgp-sign-a-message/