Sorry about this experience, but as unsatisfactory as the response of Stake's representative is, I'm afraid is true. There is fraud here and there, even in fiats online and in banks that were supposed to be more traceable than cryptocurrency, yet stealing in accounts happens and banks can't truly provide a detailed reason for it or trace it whatsoever.

And I believe Stake can't provide additional information more than what you already know yourself since it is BTC we are talking about. Every normal transaction flows are visible to all. Only that you and they can't access the receiving end account that could later use m!xer to make it untraceable. I don't see how they can help here, unless for a refund.

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Another point I want to ask to everyone here
Why there is not authenticity check when the user logs in from a different country in a day's time or even whenever he logs in from a different country rather than his home country.?
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My friend, hacking is more than this, authenticity checks will be a forgotten issue when they are in. Hacking has different levels.