last friday I was meant to pick up my freelander but I had to work late rang them and they said fine I could pick it up today now I have paid a deposit and they took my bmw in part x now they hpi it and said ok now tonight they have said my bmw is stolen and has been a write off but there was no mention of this two weeks ago when they first done it if they back out of the deal now what can I do all paper work has been singed if I back out I lose a substanial deposit . will I get it back if they do