Having read the back and forth on this Flip.gg issue here, I think it will be better to summon the casino if anyone knows the handle to its customer care or an active SM handle where they can be expediently reached. OP, I understand your plight and I know how annoying that situation can be. Let me play the devil's advocate here by assuming that by any chance flip.gg has a modus operadi of moving referrals to a different section of their site once they make deposit? Have you ransacked the site to check if they actually moved your referral that way and that it wasn't a deletion?
Flip.gg is not on this forum, they don't have any ANN, as well as --far as I know-- any account or community manager that can represent on their behalf. So there's no way to summon them. If they're here, I'll be more than happy to bring this matter to their awareness and invite them to address this issue.