That's very odd. Could you have a different account you're paying for? Check out this support site article as well, it might shed some light. If none of this helps, you should get in touch with a member of the Spotify staff so they can take a look behind the scenes for you. You can drop them a line on social media (Twitter or Facebook) or by using the contact form. Make sure, if you use the latter, to reply to the automated email you'll receive directing you back to the help pages, even if it's from a no-reply!