AS Kirk pointed out in his comments, they've been trying to "help" us. And while they did refund my entire spa purchase, this really only makes up for the rudeness and poor level of service I experienced in the spa. They also never told me they were offering this refund, it merely appeared in my bank account. A nice surprise, but I'm not one to enjoy being surprised in money matters, especially when Treasure Island has a habit of playing games with credit cards and charging them without authorization.
This refund does nothing to alleviate the other stress and inconveniences my guests and I faced all week. As I doubt that Treasure Island will offer to fix any of this, my only hope is to save other brides, grooms, and their guests from going through what we did on what should be the most exciting and relaxing week of their lives.