Let's get you grooving to the music again! First of all, the most common solution to this issue is that you have duplicate accounts. First, see if you can see all of your playlists. If so, this is probably the problem. If it is, check your email to find the confirmation email sent by Spotify to see which account is attached to Premium. This should solve your problem.
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Just livin' it up in the USA!
DISCLAIMER: I do not work for Spotify. I just enjoy helping people solve their problems and get back to the music!