Whoever you're talking with in Telegram is definitely a scammer. Glad you didn't pay them anything. I don't really understand how you got their Telegram name, but there's no way they actually work for the casino.
Just keep at it with contacting their main email support and try not to blow up at them. Although I can understand that it must be aggravating and I would be pissed off too.
Wish you good luck with getting your funds.
If you don't get them we will show you how to open a flag on the account that started their main thread. While there's only a slight chance it will increase your chances of getting your funds back, it will serve to warn others about what happened and make people that find them through this forum think twice before depositing there.
ps: I sent you a merit so after your account reaches 30 Activity you can post images.
I believe this is the telegram account that there support mention in the email and the OP is chatting the correct TG account. How come that Jetwin don't have live support. LOL
The email shows that it was sent by the official support email declared on the website. The way the TG account extort OP is a criminal offense tho. Jetwin is acting very shady. There bitcointalk account was offline since June 24. I believe somethings wrong with them.