Bests & Worsts Reviews from Amazon

While the firmness is exactly what I was looking for I am not happy with the smell. I let it unroll in a spare bedroom and the next day when I came home from work the entire house smelled like mold. I immediately ran around to try to find the source of the smell and it was the topper. I put the ceiling fan on and opened a window (even thought it was only 20 degrees outside) and shut the bedroom door. I let it air out for days turning it now and then. It isn't helping. It still smells like mold. I am so disappointed. How can I return this now that it is 10 times the size?