Pottery Barn

I am so upset. recently, I spent almost $3, 000 at Pottery Barn in Birch run, MI.

The bedspread I purchased was marketed king size. However, weeks later when I moved and put it on mu king size bed, it was actually a queen size. All I want to do is to exchange the one I have for the same one in the right size. The store manager refuses to help me in any way. I do not have my reciept. It was a cash sale and reciept said all sales final. SO I threw it away.

Please help me get this very expensive comforter exchanged for the right size.
ELizabeth Kish
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Thanks