You should be able to use the chat assistant to request a chat with an agent or a call back.

What options you see may depend on your particular issue and how busy that department is at the moment.

Try entering "agent" into the chat window. You may have to provide some context to reach the correct department. If you see a "Still need help?" or "More options" choice, either of those should lead to a call back option.

If nothing else works, try this link:

https://www.ebay.com.au/help/eua?id=5275&mkevt=1&mkpid