eggchange.net é seguro?

EggChange exchanger. Created application number 2722. You give: 20 Zcash ZEC, You receive: ***** Tinkoff RUB, To the account: 4 -----------, Within a couple of minutes I received the details from the operator. Instantly translated the crypt, after 4-5 minutes, the operator confirmed the receipt and made a ruble transfer to my card, but ONLY - 160737, DON'T PAY 4000 rubles, explaining that during these 10 minutes the rate fell and the Application is a preliminary calculation !! ! I have been changing the crypt for 1.5 years and now, no one has ever transferred more or less money, if suddenly the rate began to rise or fall when creating and executing an application. And here, on you, in 10 minutes I was thrown at 4000 rubles. No self-respecting exchanger does this. Shame, not an exchanger !!!