Banned incorrectly from Facebook Marketplace. What can I do about it?

I was banned from Facebook Marketplace because its automated system thought a bicycle I had posted was a gun. It... was a bicycle (a 2022 Specialized Enduro, for those curious).

I reposted the same listing (a bicycle!) and it flagged me for evasion and permanently banned me.

I can't figure out how to solve this. I've filed "appeals" (they go nowhere), and no matter what I do I can't seem to get in contact with someone who can help here.

How have others navigated similar things with big tech that has no visible, helpful support?