Avoid payment in Spotify?

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http://androidforums.com – I have Spotify premium (30 day free trial) on my PC. I have the Spotify app on my phone, and the 2 day free trial ended on there a while ago. I think at one point, I considered paying for premium, but then I realized I could download and listen to my playlists on my phone without it. I already gave them my card info, but I would like to take it off. I don't want to cancel my subscription, just take my info off so they can't charge me, and not let me decide if I want to keep it. How do I take my card info off Spotify without deleting my account? (General)