I bought a stargate a year or two ago from a guy up north who had advertised it. We'd agreed on a price and i paid him in full.
Well it was a couple of months before bill (the Aussie pinhauler guy) was up that way. We both knew he would be up there that week and i get a Call from Bill saying he'd rung the guy to say he'd be there to pick up next day and the guy told him he was packing it up when he realized he didn't want to sell it.
I ring the guy and he says, i';ll give your money back but i'm keeping it.
No legal threats or anything would sway him and he duly returned my money that he'd been sitting on for months.