Booked a disappointed snorkelling trip: price was ...

Booked a disappointed snorkelling trip: price was higher than further down the street for less service. We ve been told there will be max 8 people on the boat - there were 10 in the end.
We were told full equipment is provided, and it was confirmed twice there will be fins on the boat. When we got to the snorkelling site, we discovered there were no fins on the boat, and the current was too strong to explore the site. Not ok