If the album you’ve purchased is missing a track or two, you’ll want to make sure there weren’t any hiccups during the download process. You’ll find some download troubleshooting tips here:
If the download itself is complete but a track still appears to be missing, you’ll need to contact the Artist or Label directly to find out why. Artists and Labels retain full control of their catalog, and for one reason or another may choose to exclude tracks from their release on Bandcamp. To get the full scoop on your purchase, click the "Contact" link on their Bandcamp page.