Have you had an email from Ebay to say that the seller has cancelled the sale and a refund is being processed?
You can email the seller and ask him to refund you. They should do that promptly.
If not, and it is after the latest estimated delivery date, you need to open an 'item not received' case through Ebay.
"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)