I fixed it! I had this issue as well, no response from FB for over a year!
I found a post in a tech blog from someone that said he could help me unblock my website domain.
He actually fixed it and UNBLOCKED my website. It was a while ago, and my website never got blocked again.
I think his name is John, I reached him through email, firstname.lastname@example.org
I really hope he will help you, he really saved me from a huge headache!
I am also having problems with facebook. It is very frustrating that all you can do is follow the help desk instructions or report to the issue by filling in the blanks in the form and send.
How do I talk to the tech support on this? I'm so pissed that I have sent the problem to them everyday for 5 days.
I'm in wolverine mode now.
Thanks for the helpful resources you provided. But if you delivery some thing, then check them via https://viettelpost.com.vn/ as this is a good service. I used a shipping on the Internet that had not good. So be aware of that!