So Bummed! Excursion booked thru Trip Advisor and they Cancelled it!

[Vlgg731]

I booked an excursion for December 25th on the Trip Advisor website entitled Best of Half Day Snorkeling and Beach Tour.  It had great reviews and I was excited they would be open in Christmas.  Nothing the ship was offering was sounding too exciting.  The website let me book and pay-$513 for it and a few minutes later I get an email that the vendor has cancelled my excursion.  It really burns me that they didn't cross Christmas Day off their calendar if they were not going to allow me to book or if they were full that day.  And now I have to wait 3-5 business days to get my money refunded.  Please be warned about booking excursions on a holiday thru Trip Advisor.  I have had great experiences in the past booking thru Trip Advisor but this really frosts me!