It is unfortunate you had this experience. For over 6 years as you have said you have been with the casino, do you not visit their terms and conditions of services? do they not send their customers mail of upgrade in their services?  so as to keep them abreast of unfolding development on their  site? possibly, you must not have been following up with activities or you just feel less concerned about the whole thing. Knowing fully well that you have such an amount of asset there what you should have done is to make sure your account is up to date because that asset is not worth that risk of losing them as casinos are also looking for funds to do away with. It is unfortunate his has happened unless a reputable member could help you out in reaching out to the casino to give the benefit of doubt in proving your real identity so as to access you assets.

How come you have been here for this long time and you have no been active in contribution in any ways but just a spectator observing activities and events.