As I said in the original post, I would have much rather not posted this on a public forum. Luckily the regional manager quickly got back to me after I did this (although I believe he read the letter I sent him and responded because of that, not because of this post). I'll check with a moderator to see if I can edit the title to keep this updated.
As for The Dublin service manager, he was very nice to me the other times I took it in for service, and to be honest it did surprise me when he dismissed the windshield issue in that nature. But I can't help but feel he didn't do his job properly when so many other service issues fell through the cracks. Even if he wasn't directly involved with them, it's still the responsibility of the service manager to see things though.