In a way, I am glad DJI are sticking to their rules, as it could have been mine or another user's drone and sold without permission. You also say little to nothing about eBay, or if you tried using their refund process.
Having read your initial post, and feel the tone you have used to some replies made to members, I am not at all surprised that you never achieved your aim with the seller, if, and I repeat if, you acted in the same way with him/her.
P.
Can I ask when was the last time you watched one? Also, why should you have a say over what I or others watch - if what is shown is legal?
Who the ****** are you anyway wearing the type of shirt you do? You could give others the wrong impression :-)