Are you sure you're logging in with the right details? It's very easy to have both a Spotify and facebook login.
If you are sure, I suggest you submit an online contact form; and someone at Spotify can look into it for you.
If you get an automated reply; make sure to reply to it directly (even if it's from a no reply); and it will be sent to the Spotify staff.
This post was by Taylor - I do not work for Spotify! If this solved your issue - Mark it as a solution!If you like my post - Please add Kudos! || Spotify Profile - Taylor | Feel free to PM me - Here ||