Lost purchased music from itunes upon synching.

I couldn't find a direct answer to this, but I basically tried transferring some purchased music from my iPhone 4 to my home itunes music library so I could then get them onto my iPod classic. Well it transferred part of the music downloads, and not all of it. However, the music that was not transferred over to my home itunes library has now been deleted from my iPhone as well. It basically neglected to transfer 1 entire album and then only transferred 3/4 of another album. Well I attempted to re-download one of the albums from iTunes on my phone because thats where they were originally purchased, but received the following message. "This album has already been purchased would you like to buy it again?" I still have the receipts Apple sends to my inbox for this purchase, and refuse to pay for the downloaded material again. Any help?

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