This is a really complicated situation, as I can see from your description.

Would you mind of sharing the URL of this casino, so we can be sure which one you write about?

Are you aware of violating any rules, though? Let's say the maximum bet or something else?

And also, didn't you find any rules for this bonus on the casino site? Every bonus should have them; that is why I'm asking.

Please provide some more details, so we can try to help you out.