Hello Arkadiusz,
I have validated your VAT number manually and issued you a refund for the VAT amount charged. You can download the updated invoice from your Payment history page.
To update it in the Billing details for future payments. Please follow these steps:
1- Go to your Personal details page
2- Update the Billing details
3- Scroll down to the bottom of the page and you will see a checkmark that says "I want to update the billing details in all active subscriptions". Make sure to select this box and then save the changes.