As someone who worked in the spa industry for 12 years this is something I have seen more times than I can recall. It is a piece of advice I would like to pass on to the general public:

If you have to buy a Christmas present for someone who is miserable, please do not get them a gift card to a spa thinking it will “mellow them out.” It will not. First they will show up late to the appointment and complain when instructed to fill out a health history. Next, they will go out of their way to be rude to the staff and service provider. When the session is over they will say they didn’t like it and then go online and give the establishment a bad review. Your hard earned money and good intentions will not be appreciated. Someone who is miserable will continue to be miserable no matter what you do for them. Instead, ask them what they want for Christmas.