Won big off $2500 promotion

i had a notification from ngslots $2500 promotion immediately started with a $1k buy bonus $2 bet hit $21k then kept playing thinking its not real, hit for $41k,then again $40k now all the sudden no wins after they tell me i need to deposit $100 and no option for cash deposit it brings you to buy bitcoin its frustrating thinking I had $60k in this site now $10k but looks like they don't payout so I'm still stuck in the same position in life