Now we’re getting somewhere. So basically it comes down to a perception of the standard of on-board service and crew attitude falling below your expectations. Fair enough; you’ve paid for a premium service and you’re well within your rights to expect the same. The problem is it’s all subjective, isn’t it?
Quite honestly, the best thing you can do is to write a polite letter or e-mail to the airline describing, in non-emotive terms, the problems you experienced and suggesting that they consider whether, in this case, they had met the required standard. Phrase this in non-emotive terms so it appears that you’re offering them constructive feedback.
The problem with escalating what, to a third party, would appear to be a trivial issue, is that you devalue any reasonable case you may have.