UPDATE
Kraken just credit my account. I am sorry but I had to publish my problem because it was the only way to find a solution. I also tried to inform you because I believe in transparency. I hope to be the last person with such a problem. I am afraid I will not be...
I do not change my mind about Kraken.
Thank you all for your support (including Dargo).
I'm glad to hear that your problem was resolved (finally). I just want to reiterate that it is definitely important that people publish issues like this, so that the community at a large is aware of what's happening with some users; I don't think you should feel bad about informing people of your problems (as long as the conclusion is also published, as you've done here).