then what does this mean and plus im a sprint customer
You are registered for Spotify Premium until 2014-06-24. After this period your account will become a Spotify Free account. Sprint Customers: Users accepting a trial will remain on Spotify Premium and will be billed up to $9.99/mo on their Sprint bill and may cancel at any time.
Sprint run a payment scheme alongside Spotify where Sprint collect your subscription fees instead of Spotify. However, you need to have manually set up that payment on Sprint's website (which includes text verification etc), so if you haven't done that you can safely ignore it. 😉