I won an auction yesterday for 2 sofas. No one else bid. I had asked a question of the seller which was ignored. I bid anyway. When I asked when I could collect the sofas, they told me they had sold them so they weren't available.
Unfortunately sometimes this happens - the seller sells elsewhere. Nobody can make them sell the sofas to you.
You have the option to leave feedback, or you could just forget it, and look for another bargain.
If the seller asks for a mutual cancellation refuse it then they will not get a refund of their FVFs, punishment enough for not taking the listing down if they sold elsewhere. Uless you paid by Paypal, which I presume you wouldn't do for a pick up item, you are not out any money so just move on and look elsewhere for your sofas.