When you look at your subscription under your settings, do you see the following message: '' Your subscription is associated with our partner Fido, please refer to Fido for questions regarding your subscription.''?
Maybe you didn't activate your subscription and you are currently paying the special rate (0.99$) for Spotify!
If you don't see that message under your subscription page, please visit this page. It's a step-by-step guide to activate your free subscription to Spotify Premium!
Hope this will help:) You can reply to this post if it didn't fix the problem.