I bought an account via runescape gold and got scammed.

I bought an account from. King Amaz0n I gave him 20 mil for his level 98 account. As per going through everything he gave me his snapchat to send me videos and pi tires of account. After it all I traded him the 20mil he logs off and then blocks me on snapchat. I haven't received the account. He has 2 listings and what I purchased was the level 98. I stayed up for hours waiting for a response but nothing was there.