This is like a recent exchange of e-mails I had with Disney about their UK website. I booked our pre-cruise stay online, paid a deposit. A few weeks ago I thought I may as well pay the balance. The payment link on the confirmation e-mail goes to a webpage that doesn't exist. So, I go to the website, click on 'Existing Reservations', which takes me to a page that says, sorry, you can't access your reservation online at the moment. Well, it said that for well over a week!
But when I e-mailed Disney they refused to even consider there may be a problem with the website. They just kept making various suggestions about deleting cookies, refreshing the site etc. Finally, a couple of days ago, I did manage to access my reservation online. Went to pay, but can't - it keeps coming up with error messages, usually saying that I haven't entered my credit card number when I have. I've tried several different credit cards and on several occasions, but no joy. So I still think it's a problem with the website.
But again, Disney won't accept that. They can't explain why I can't pay online but infer it must be my fault. And all they can suggest is that I phone them to pay the balance. Which I will do eventually, but not until the due date. Meantime I'll keep checking in case it finally dawns on them there is a problem and they fix it.
By the way, I also have a reservation made through the US website and have no problems accessing that one. It's just the UK website that is playing up.