I assume you have paid.
My advice, genuinely, would be to wait a day or two.
Stop messaging the seller - not everyybody is online 24/7 and it may be that the seller works full time and only checks their Ebay and messages every few days.
If you paid on 16th, that is only 3 days ago.
"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)