I can not believe it. No matter how rich you are, when you buy 10 BTC, you spend a significant amount. You can not invest such a large amount by choosing an unknown exchange without informing yourself. From what I read, crypoesto.com is just a scam. However, I hope it's just a joke and you have not bought 10 BTC on that exchange, but if it's true then we learn two things:
1. You do not have to overly trust friends.
2. We do not play with our money, treating things superficially.