I have just received an e-mail from facebook support. The guy finally solved it for me! (THANKS!!) It took quite a few e-mails though.
( But answering your questions: I use the page for work but only contact wise, not a business page.
I used a complaint platform in California that forwarded my issue to Facebook support. So that's the e-mail I was replying to.
I have sent my ID - it was the first thing they asked. Then answered some basic questions about myself. It took a while to solve but I'm finally in.
My page was always online, only the access was blocked.)
But this "dead end" issue was very weird...I just couldn't find anything about it online....
Thanks for your availability anyways!
Have a nice day both of you