The last item I sold on ebay was a Cisco router. It was sold as defective for 5€. In the ad, I mentioned in 3 languages that item was sold as defective because there was no way to change settings and password.
The buyer complained to ebay that it didn't work as advertised. Ebay sided with the buyer. I just paid back the 5€ and didn't waste any time. Told the buyer he could keep it.
Then my account got blocked (by ebay) for "possible fraude". A short while later, my PayPal got blocked. Again, possible illegal activity. PP at least notified me.
In both cases, mailing them got a standard reply, or none at all.
About a year later, while cleaning up old passwords, I tried my ebay account and was granted access.
The account never was hacked, or used for anything remotely dodgy. My PP account never got reinstated.