The question here is... why you don't change to another casino if you didn't liked how bitcasino de al with the high rollers. For sure a lot of casinos would be really happy to have a high roller like you and they will give you some nice and huge promotions to ha you happy on the ir site.
The better option for the OP right now is to move to another reputable casino he can find in this forum, where they can handle high rollers. Because it seems that his case will be shelved and not really resolve his issues. From now on, don't deposit to this site and try your chances with top casinos found here.
It seems that the casino is not willing to address his issues and they are letting him go as a player. Let us say, they are not the culprit of the 88eth loss, they should have shown the willingness to investigate his case as it is not a small amount.
With OP’s experience, definitely he should shift into other reputable casinos wherein his funds will be more secured most especially that he is known to be a high roller.