Sellers can't just close cases.
How long ago did you receive the jacket?
Was it a private or business seller?
What reason did you choose from the Ebay list when you opened your case?
Private sellers can refuse 'change of mind' returns as they are not obliged to accept them.
"There are two ways to be fooled. One is to believe what isn't true; the other is to refuse to believe what is true.”
Søren Kierkegaard, Danish philosopher (1813 - 1855)