Did you buy it within 30 days?
Were you logged into your Ebay account when you bought it or did you buy as a guest? If that is the case, you need to find the email you got from Ebay when you paid and start from there.
"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)