Again, like I said in my previous comment, if things still be the same as op said it initially,
Then please know that op made mention of having passed level 1 and 2 verification before the whole brouhaha started, he was find with his account but after using VPN, I believe that triggered the level 3 and 4 kyc requirements on his account, after submitting the requested documents and getting rejected multiple times, they resetted the whole kyc process on his account, he had to start all over from level 1 again, and right now, he's stuck with level 3 or 4 - not sure which level..
The moral lesson here is to just avoid doing what ever the casino say they don't like, doing so might just be you inviting unnecessary problems into your life, $6000 is not a small amount of money to lose to be honest.
IMO these "levels" are only to make things more difficult for players and delay their withdrawals.
Claiming that they have to see a "stamped utility bill in paper form and not older than 1 month" is ridiculous, dumb, abusive and everything else all at once.
I've worked in tech support and I've been doing KYC for a while for a crypto company and I tell you this requirement is dumb and made to fail people.
If they're telling OP that the only way he can proof residency is a utility bill in paper form, they're literally lying to him and trying to scam him.
It can be anything with his name and address on it, including a credit card statement or a payslip and it doesn't have to be in paper form!
Try sending them a mobile phone bill, OP. You can request that in paper form and it should have your name and address.