It is too late to do anything through Ebay.
If you opened an Ebay case for the return, you needed to follow it up promptly by asking Ebay to step in when the seller didn't send replacements or refund you.
You will have to chase this up with the seller.
"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)
