Problem with Windows Phone 8.1 Music

[tallguy804]

I purchased a song from the store and it showed up in my collection. I was able to play it a couple of times but now when i go to play it all it plays is the 30 preview that is available as if I was listening to it in the store an d not in my collection.

How do I get the full song back? I went back to the store but there is not an option for me to re download it.

Thank in advance for any help.