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As per confirmation from 8888 that you unsubscribed successfully then your subscription won't be renewed and you shouldn't be charged. Keep those text messages for future use. Wait for your next bill and prepare yourself for any unwanted charges. Goodluck!
Just check your next billing if you will be charge for it. If yes, then just tell them that you already response to the SMS to stop the Spotify service so they can reverse the charges. If it does not show up on you bill, then clap your hands you got "free" premium subscription without paying for it.