If you would like to close the Spotify account that was created through Facebook and get all your stuff moved over to the other one, just reach out to the Spotify Support. They'll help you out.
Contact form: http://bit.ly/SpotifyCF
If you get an automated reply email telling you to check the Knowledgebase or the Spotify Community, you need to reply back to it, even if it's from a no-reply address.
Spotify Support usually replies within 24-48 hours :).
Hey there you,
Yeah, you! 😁
Welcome - we're glad you joined the Spotify Community!
While you here, let's have a fun game…