It certainly looks like, after being marooned up the stream without an oar that your goose is cooked.
Through all my years on this forum did I hear that Facebook enabled an account for copyright infringement.
Facebook is a big system with billions of users; although the company may have sent a retraction, Facebook will not connect with your account. Facebook with all of those accounts does have time nor the skill and your account probably is not important to them, they have so many.
You have appealed with no success. Your many appeals probably created confusion in the system which is automated.
I suggest that you grieve your account and go on to something else.
That's the way the cookie crumbles.