I have been directed to seek your help paying for an upgrade on my account.
I get the same error no matter what computer, or browser (even incognito).
It allows me to enter all my payment info, but the black box is spinning and the submit button is grey and there is a pop-up that says 'Something went wrong. Please refresh.'
I was direct here when the support request by email only allowed for cancellations or refunds, which seemed to mystify the person advising me via chat.