Hey there @daniqueleijten, and welcome to the community.
Hope you're doing great!
When you switch over to Premium for Family as the sub-account - all payments go to the head of the account. Since you're still getting charged - you may have not been entered to the plan properly.
Can you login to your account, and tell me the status of your subscription?
Let me know how this goes 🙂
Billy-JRock Star 24
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.