Most Help pages have a Contact Us button or link at the bottom. If you click on that and click See More in the pop-up that appears, you should be able to find a Contact an Agent option. You can use that to ask for a call back or open a chat session.
Start by going to Help & Contact at the top of most pages and enter some search terms. Like "Didn't receive item" or "Payments", or whatever you problem is about.
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Never sell anything on eBay that you can't afford to lose.
