It is curious that you wanted to speak only to a supervisor…
What did you want that the other agents could not provide when you rang them in those 4 instances prior to your flight in Business?
Presumably once an airline changes an aircraft, which impacts the availability of a cabin, the only other option if you choose not to travel on another day, is a refund. Was that specifically requested for or did you think Emirates could change the aircraft just because a supposedly esteemed member had insisted he flies in First?
In short, did you ask for realistic compensation?