I heard back from Joyland finally.
Because my play included not only high-stakes blackjack and video poker, but also high-stakes roulette (even though I was spending five minutes at a time making cool patterns on the roulette board and at points winning and losing many hundreds of dollars per spin, and not playing "red and black" or whatever), I get zippo. My response to their short statement received no reply, so they've obviously made the determination not to pay me, period.
I found it interesting that their reply made reference to "the forum", as if obviously all my questions about the stolen money should have been answered here (or a different forum?), and why on earth would I expect a personal reply in under six weeks?
As far as I'm concerned, even if I was betting the same amount on red and black and sitting there spinning the damned wheel, that's valid casino play. They certainly wouldn't be refunding my money if their comp points had been set lower -- they would've made me a VIP and sent gifts to my house. Therefore keeping ANYONE'S money is dishonest here. If I was playing on a signup bonus, fine, there are often rules about restricted games. But I wasn't. I was playing my own money.
And I've never seen a single word justifying, or even admitting, the crude and obvious doctoring of transaction logs (which I wouldn't be surprised had to be done on Playtech's end). As if I'd forget cashing out a sizeable win, especially when I have email confirmations with transaction numbers.
Forget "advantage play" and "software errors" and all that. Playtech has a casino that altered transaction records. Their response, twice, to my complaints was "we've forwarded your information to Joyland management and you'll hear back from them." It's disgusting.
I really don't expect to see any money from them now, nor do I think that Playtech, with its ever-growing stable of rogue casinos and blind acceptance of a casino group that cancels withdrawals and alters withdrawal records for its users, will do a thing about it. I'd love to be proved wrong.