Not if you're Charlie Flynn on a vendetta. If the complainant doesn't like the response, he can file an appeal with the folks in Boston who police these things. And that's what Charlie did. Anyone with the slightest experience in these matters - and I have to assume that includes Charlie - knows that that appeal disappears into some obscure file some place, never to be seen again. The Boston policing folks (I'm told there are a grand total of two of them) have better things to do with their time than investigating alleged violations of the open meeting law. They're too busy going after officials with their hands in the public till, or who have been taking bribes, etc., things that too many MA politicians commit all too often. So it's extremely unlikely that anything will ever be heard again concerning Charlie's appeal. It will just sit there.
The explanation given by the finance committee to Charlie makes eminent sense (and since I'm the one who prepared the endorsement and got the members to sign it, I know it's true). He can't possibly think there will be some sort of righteous punishment inflicted on the members of the finance committee by the powers-that-be in Boston. So why would Charlie file an appeal? To continue his vindictive harassment of the members of the finance committee for daring to endorse his opponent. If he can cobble up some other explanation, he can post it by comment on this entry. He knows how to do that.