With Simple Delivery, the buyer pays Ebay for the postage.
If you don't use the label, the buyer will be refunded.
There is no way for you to get the money back for postage.
"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)
