This is totally absurd. So the next time you win on slots they will probably say that the offer was for
BJ only and they sent you a revised e-mail almost immediately. Actually, whether they did send you the second e-mail is irrelevant because you may not have read it for some reason. As long as their confirmation e-mail to your deposit states that
BJ is not disallowed, they should honour that instead of pulling off this disgraceful stunt.
For the Sunny Group, it may still be summer now but dont think you are allowed to do whatever you like. Shame on you.