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.