Also, I understand that I am asking too much, and if it is no possible to unban all four accounts, could you unban at least one.
That's not going to work. The ban applies to you as a person so you're not allowed to use the forum anymore.
You've been banned for plagiarism (copy-paste), not merely spam.
I would agree with you if you point me to this mistake. But I never engaged in plagiarism, I Express my opinion in other people's topics and ask questions, and never made my topics on the forum.
So I don't know what you're talking about, I'm sorry.