Originally Posted by
tsg20
"Their position is that because we accepted the offer of the business class fare, it was a voluntary downgrade. In fact I did phone them from the plane when I saw that the app was offering me seats in J, and was told that there was no availability in F. I put this to them on the phone, and they said that I could have asked to be rebooked in F on the next date in which F was available, and since I accepted the next day in J, it's voluntary."
If the airline put you into Club World on your original date of travel, that is IDB and Mennens. If instead you asked to go the next day and would accept J, but a day later, then it looks to me that you agreed to that. If the original service was cancelled then various other bits of logic apply.