Who Me Too'd this topic

So I finally got through the arseache of downloading the old spotify so I could sync playlists to my sd card and left my phone downloading all night, it was still going this morning, and then the phone ran out of battery. I switched it back on, logged back into spotify, but they were all gone... all of the 50 or so playlists I'd selected to download (half of which had) just aren't in the downloaded bit any more. 

I've checked the storage part in settings, and 10gb of my SD card space has been used up - I know these are the tunes I downloaded throughout the course of last night, but how the **bleep** do I get the app to acknowledge them? I don't want to re-download them all if I can avoid it...