I'm so sorry for the OP for being scammed. "Secure deal feature"? You should have checked the site first. The site is never heard of. No reviews from trustpilot. For sure, the sites involved are interconnected with each other and only one scammer is handling it. Too bad, the OP can't get his money back in this case. Even top exchanges like Binance doesn't require minimum deposit of $500. You should have doubt its motive. Expensive lesson learned by the OP.