Missing music from my music library

i purchased three songs from AmaLee from the iTunes Store. In my world, monochrome kiss, and pop stars. I don’t keep track of every song I have purchased, but I went and looked them up because I was in the mood to listen to her music. Then I found that those were missing. I went to the I tunes store to find them, and it had the $0.99 thing on there as if I’d never bought them. What the heck am I supposed to do?!