I purchased a bed from a second hand selling site on Sunday and after putting it together realised it was smaller than advertised. I did not measure the bed on the day of viewing I just assumed it was a king single frame as seller stated in ad. Seller had advertised a king single and after our research on the product online we have found out it is a single. We contacted the seller but they have said they already spent the money and don't have the means to give us a refund and that they genuinely thought the bed they were selling was a king single. They apologised. What can we do. Where do we stand.