The postage option (surface mail) you display is a method sent by ships/roads/trains, not via airlines.
Were there other postage options to choose from, because this method is the absolute slowest.
Don't think you'll be able to open a case in Ebay and since you have chosen surface mail they may not assist you anyway as it is a substantially longer shipping method.
It's probably still coming so you'll need to be patient. Surface mail used to be around 3 months pre-Covid and in a pandemic with so many disruptions, it can be many more.
