Thank you for reaching out to us, we're terribly sorry to hear you're having this issue with the game.
Could you please the following information for us to check:
1. Name of the slot machine
2. The specific time when it happened
3. In base games, or free games, or bonus games
4. Attach a screenshot of it if possible
In most cases, the total win of the free games/bonus games (including the rest of the spins) will be automatically added to your balance when you restart the app after the issue. That's why we need a more specific time to help us check whether the reward had been added to your account.
Our apologies for any inconvenience, the more information we have the more effectively we will be able to assist you.