Apologies for the late reply, but maybe I can still help 🙂
It could be that somebody got access to your account, without you knowing it.
When someone got access to your Spotify account, please visit the Spotify account site and click on sign out everywhere and change your password here.
Also, you should follow the steps shown in this support article.
Have a nice day!
Help others find this answer and click "Accept as Solution".
If you appreciate my answer, maybe give me a Like.
Note: I'm not a Spotify employee.