Wolkernt LTD musparade.com stole all of my itunes music over 2000 songs now only have 3 songs left...wth??? Internet

I signed up for this music website a couple of nights ago named musparade.com. I paid this miserable site $20 and downloaded 8 songs. The songs went into my itunes and I played them the first night. I was thinking, " awesome " and thought the site was pretty cool. The following evening I go back to download one song and could not get the whole song downloaded. It took for ever so I stopped downloading it. Then my itunes opened and kept downloading the song over and over and over. I finally had to shut my computer down. The following morning I go to check out my itunes and all of my music is gone. Over 2, 000 songs removed and even the songs I downloaded. Now I am out $20 plus a few thousand dollars worth of music. Of course anyone would be pissed off and can't believe that this happened.