Check the email you received when you were informed you would be refunded.
This will give the reason that the seller chose for cancelling the sale.
We are other members like you so don't know why the sale was cancelled.
"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)