and if you get a naked frame and transfer your components, you could list your current bike/frame and try to sell it. Sadly, you typically wont get what you paid for it, but at least you'll get something out of it that you could put towards your new bike - that fits. Or even buy a previously owned bike in decent shape and transfer your components to that.
It really sucks that they sold you that bike. When my DH got me my first bike two Christmases ago, it felt "small" to me, but they didn't have the next size up in stock. Fortunately, the LBS said I could take it and ride it for a month to see if it felt small once I was rode it some. It did - and they ordered me the next size up. I was glad they did the exchange, but I was kinda ticked that they even let me out the door with it. It NEVER felt right to me - even in the shop, on the stand it felt too small. I don't know why they even bothered telling me to take it, but I humored them and took it back the next week and had them order me the other one.