Thank you for your answer,

I'm not saying that they have to do something, especially if it's me that makes these big mistakes.

Personally, I think that if they wanted to, they could help me to recover my eth (like to explain in my post with bittrex and the private key eth ...), but nothing obliges them to do it.

But it's not normal how they managed my request ... I had the impression of talking to a wall ... They have not even bothered to take a look at it to my problem ... it is hardly if they read my questions completely ... I was entitled to answers on half of my questions read, I had to forced them to watch my problem! and they did not move a finger!