I had a very similar experience and pretty much gave up on eBay (after 23 years of being a happy customer).

https://tsak.dev/posts/the-decision-is-final-and-we-cannot-r...

They still owe me over £100 but it's probably useless to attempt to collect.

The best bit was that I was asked to log into my other account but was unable to connect to customer support because it was suspended forever.

The only sad thing is that eBay is that perfect place for selling random things that are too valuable for Facebook marketplace.