I preordered an album and it only charged for one song

I preordered Yours Truly while the song Right There was available. iTunes then sent me a reciept for only that song and it says that i didn't preorder the album. How do I fix this without spending more than the $8 the album costs to preorder? It charged me only $1.29 for the one song but i dont want to have to buy all the other songs separately..