Bottom line is that the cake was perfectly fine when you left which you can, and have, proven with a photo. That's why we take photos after the cake is setup before we leave. What happens after that is absolutely not your problem. I would not offer one penny back. I consider that kind of crap blackmail. "I'll tell everybody if you don't give my money back"...If the blackmail works, then that information gets around too.
Exactly my point! There appears nothing wrong with the cake only one "vendor" person saying it was dry. You don't have to go any further. I can see waiting a week to complain and will hold my ground. Not everyone has a wedding planner or family available. Many brides now plan a wedding and pay for it without mom and dad's help. Something should have been done earlier yes. Photos or other proof given, yes. The proof IS the photo the baker has and that the venue recieved the cake. Someone had to have OKd the delivery. Again, the baker is covered. The bratty bridezilla does not have a leg to stand on and has lost her head to think otherwise.