The phones are not covered by eBay employees but by a subcontracting company in Utah.
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The social media accounts are used by eBay employees with good training and some authority.
https://twitter.com/askebay?lang=en
https://www.facebook.com/eBayForBusiness/ — Message button in upper right on landing page.
https://community.ebay.com/t5/Selling/How-do-I-contact-Customer-Support/m-p/32016431#M1783851
It helps to write out your problem,check it for any vagueness, and then cut and paste it into the Chat.