Thanks for reaching out to the Community about this. We hope you don't mind us answering in English as this is the official language of the forum🙂
Can you start by taking a look at your Receipts page? There you should be able to see all your charges and check if you've been double charged for a certain month.
It's also possible that you have 2 accounts with us. We'd recommend to take a look at this page to see what you can do to locate your second account.
On another note, it'd also be a good idea to check if your family or friends have used your payment info to pay for their Spotify subscription. If that's the case, they should cancel or change their payment method and reimburse you.
Hope this helps. If you have any questions or need anything else, the Community is here for you.
Help others find this answer and click "Accept as Solution".
If you appreciate an answer, maybe give it a Like.