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Hey, I can help you right away.
You need to cancel your trial if you do not want renew Spotify after this for 9,90 € per month.
You can cancel here. However, you may receive a cancelation problem or error, in this case just change browser for a while to cancel.
But, seems to be you're already canceled your subscription, because it become to Free service 23/05/12. So you won't be charged.