If you're still having difficulties deleting your playlists on the phone, we'd first off recommend clearing your cache and restarting the app. If that doesn't do the trick try a clean reinstall following the steps here.
In the meantime you can also consider using our web player to delete the playlists.
Keep us in the loop and don't hesitate to ask if you have any other questions.
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"Where words fail, music speaks." - Hans Christian Andersen