Thanks for michaeladair to this thread ( it was not necessary) and thanks to vod for the opinion. At the end I've admitted my "stupid" mistake and with the help of the community all was "recovered" but now I think I don't deserve the negative feedback from quickseller.
It's not what happens to you that matters, it's how you react to it.
You can get a good example of how NOT to react by looking at the recent issue with takagari. He made it so much worse for himself.
Give it some time, and contact quickseller in the future. Let all parties cool down. Don't keep harassing him if he is not budging.
I think that I've reacted properly , I didn't go away from the forum I tried to resolve the issues generated due my mistake ( email not changed) and at the end with the help of community no one of the parts has been damaged.
Now he left me negative feedback, but it was not necessary.