You can change your card or details either in the brsk portal Account Login | brsk on the Billing & Payments screen, or with support via support@brsk.co.uk or 02039 255 299.
On the portal
Log into Account Login | brsk.
Once you have logged into the portal, click on the Personal Details tab.
Scroll to Billing Details. Now select either Direct Debit or Card Payment and then click on Update Billing Details. Once you've updated your details, click on Save Changes.
For guidance on this, please reach out to support@brsk.co.uk or 02039 255 299.