The ebay support service often helped me solve various problems on their marketplace. Several times I had problems with the site, or rather with my personal account, but other times it was various questions that arose when placing an order. In the beginning, when I was just starting to use it, I did not know where to turn until my friend suggested that I read about
eBay customer service so that I could better understand how it works for them. I found that information quite useful and relevant, so I think it will help you too.