If the $6,000 was actually removed from your balance rather than simply left for a later withdrawal, then I think this is worth looking into more closely.
The important distinction here is whether those winnings came from your own real-money deposits or whether any bonus was involved.
If you were playing purely with your own deposited money, Casino Guru generally considers rules that cap winnings based on a multiple of the player's deposit to be unfair. A withdrawal limit that simply determines how much can be paid at one time is one thing; permanently forfeiting legitimate real-money winnings above that limit is quite different.
It's also relevant that you say the 100x deposit condition only appears in the message you receive after depositing. We haven't been able to find publicly available General Terms and Conditions for Winshift77 ourselves, so please keep screenshots of that deposit confirmation, the rule they relied on, your deposits, the $16,000 withdrawal request and anything showing that $6,000 was removed.
At this stage, since the money has already been forfeited, I think submitting a complaint with us would make sense. Our complaint team can examine exactly how the rule was presented and whether it was applied fairly in your case.
Just make sure to mention whether you used any bonus while generating the winnings, as that could materially change how a maximum cashout rule is assessed.
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