Won't allow me to change billing details

I've been trying to update my banking details for over a week online. If I manage to login then there's an error whenever I try to submit my new details. The alternative option seems to be to fill out a form and send a copy of my id. Neither of which I want to do. This is 2024. I don't need to fill out forms. Your online portal should be working. I've submitted a new query via your website,because once again this is 2024 and I don't need to speak to a retard on the phone, with a confirmation letter from my bank. Accept it or don't. If you don't want to accept it and refuse to update my banking details without a form having been filled out (even though I'm trying to do this while logged in with full access having entered the OTP) then I'll just wait until the debit orders start failing and I sign up with another provider.