My question involves vehicle registration or title in the state of: Washington

Hello, I am buying a car prom a private seller, who stated the car has a clear title but they are moving so it was boxed. I paid 900 and in 2 weeks have to pay another 900 to pay it off. I just found out the car has a lien on it from a place called pawn1 which I am sure is a pawn shop. The seller did not inform me of this, and i have not informed the seller I know. I have emailed the pawn1 place and will call them in the next couple days if I dont hear anything. But what can I do in this situation? Thank you.