Are you sure you're logging into the right account? It's very easy to have both Facebook and Spotify login details!
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Normally when this happens, you have accidentally created and logged into a duplicate account.
Try following the steps outlined in this post and see if they can get you back into your original account. If not, there is a link in that post to get in touch with the Spotify team directly and they can lend a hand to track down your account.