Were you still be able to login? Can you check your payment method? There are several reasons why Premium Subscription stop at some point. Your payment maybe declined due to some reasons, or your bank might have declined or stop transactions with Spotify. You may want to call your bank and ask inquire about your bank account. Otherwise, if you are sure that your subscription is cancelled in error, you can send a direct message to @SpotifyCares thru Twitter.
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As much as I would love to fix your account, there's nothing I can do for now. I am not an employee of Spotify, I am just here to help. Nothing to worry, if you want to reactivate your premium subscription, @SpotifyCares can help you.