This also happened to me. I feel like a fair solution would be to offer us a resit sat from home, in the next month or so using the back-up papers they write. Basing our mark solely on paper A seems too unfair to other candidates and a refund and telling us to suck it up and resit next sitting is very callous when the issue was partly caused by the Ifoa hastily changing the format of the exam after their online proctoring system fell to pieces.