I would suggest to get the desired solution a shorter, more punchy email is required setting out the facts and your preferred solution. I had lost the will to live by the time I got halfway through it.
I would also leave out the threats about Etihad etc. Whilst this may be the case I generally find in business that if someone sends me a threatening email it gets left to last to be addressed. If however someone makes a polite complaint I try to deal with it straight away.
Emirates customer service is, I would agree, very average.