I've used e-bay for years; very few problems.
Two separate items I've bought haven't been delivered to me over the past month or so. Both times they've been marked as 'despatched' but not arrived. Both times I've contacted the seller who just hasn't responded.
Still sitting the second one out, but e-bay refunded me immediately when I contacted them after the seller hadn't replied first time.
What is the reason for not replying? Does it mean that you don't have to refund? One a business seller and one a private seller who sells loads, so no way they haven't checked their mail.