Rick is correct the only way is to vote with your wallet. Contact Etihad and ask them to status match your level with Emirates. Take a premium flight with Etihad and then write to the director of customer services with your complaint. Include a copy of your membership card and ticket and see if they really do want to keep your business. Do a bit of research and try to find the name of the director so you can address your complaint on a personal level. Believe me any sensible company will want to hang on to your business.