The seller needs to send you a feedback revision request.
They can do this from their feedback page but they do have to initiate it and start the process.
The request will come as an email from Ebay.
Make sure you actually have your refund before you change the feedback.
"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)
