Sorry to hear...
I just had some very good experiences regarding BP service. Something was very badly wrong with my Villeret Moon Phase and the watch also needed a full service.
I took the watch to a BP Boutique and the Manager did really outstanding job - the watch was fixed in about one month.
My experience about different brands is that the Brand Boutique might not be the very cheapest place to deal but they still can give a level of service most ADs can't. Still, the Boutique staff is dealing with Colleagues when organising things with the Factory.
Later, when I will have a good camera in my hands, I will show some pictures about things a Boutique can organise.
Best,
Kari