Thanks for reaching out to the Community about this.
Hope you don't mind us replying in English as it's the Community's official language.
Sometimes Spotify users create more than one account for different reasons. In such a case you might have both free and Premium accounts. If you're accidentally logged in to your free account, you won't be able to see Premium features. You can however still use the Premium account.
We suggest you head to this help page. Make sure you check all the troubleshooting steps and especially the ones for finding other accounts.
In case you decide to cancel the Premium subscription, simply head to this help page.
Hope this helps. Keep us posted.
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“Music is the strongest form of magic.” Marilyn Manson