I opened an account on Roobet site few days ago, I have some money that I won in bets, they are still there. I don't remember which email I created the account with. Now I will login to my account.
It's quite strange that you forgot the email you used when registering even though it was just done a few days ago, maybe you can use the forgot password feature and enter every email you have because if you enter an email that is not registered there will be a notification that the email is not registered or you can use the method from Apocollapse, and hopefully you can again have access to your roobet account.
The problem is he forgot the email he use that's why its hard for him to get back his account by using the forgot password feature and maybe one option he can try is to contact their representative then ask for help maybe he's KYC can help to solve this issue but if this will not work for him then maybe one last option to do is to back track where he store his emails and password to retrieve his account.