This happened to me after I sold some AirPods. Not just with Buy It Now, but after I waited a week for the auction to end, and was literally about to post them in the mail. After being suspended I could no longer access the listing.

I managed to reach their customer support line and had the most arrogant agent I've ever had in my life. Like someone who genuinely felt like I was some kind of evil hacker, and actively got off on punishing me. It was disgusting.

FYI - I'm just some regular person who reads this website, and I honestly feel really weird actually being one of the people who posts replies. But reading this brought back such angry memories of that encounter that I felt compelled to actually create an account and share my experience.

In the end I switched to one of the much better app-based modern competitors that we have in the US (edit: it was Mercari) and never looked back. Too bad the rest of the world is still stuck on eBay.