I have agreed to purchase a 2009 Elddis Oddesey 550 caravan which I pick up tomorrow.The deal I got was fair and better than other dealers I have spoken with.After agreeing the price to change when I came home I was looking at the Explorer group site the makers of the van when I saw they had an offer of £250 off any van or you could use the voucher in the dealers shop.The dealer did not mention the explorer group offer.I contacted the Explorer group customers service dept.to see if I qualified and they said I did.I contacted the dealer who said they had not been told of any such offer I asked could I take the £250 off the money I owed them they said no I would have to pay the agreed difference and if the £250 was correct theyd send me a refund when I asked why? they said they did not trust the Explorer group to return the money to them quckly( which made me wonder what kind of company are Explorer?).Would you pay them the agreed difference? or would you deduct the £250 and give them the voucher?Thanks for any advice.