Disappointing - I've never spent so much wasted time.

Booked an excurision through carnival to Gibbs Cay (stingrays). This was set for 11:30am. My husband, my 10 year old daughter and my self attended. They shuttled a group of us to the beach/bar area where the boats were to pick us up at and told us to wait either at the bar or at the beach until our orange wrist bands were called. Not wanting to wait at the bar area with my 10 year we waited under the blue beach umbrellas as instructed. After waiting for 1 1/2 hour my husband asked the bar tender the status of our trip. She told him that our cruise ship does not leave until 4pm(even though our ship we had to be back on at 3:30pm) and to sit back down until we were called. While we waited my parents and in laws came to where we were at around 2:30pm. They had already finished their excursions and thought it was odd we weren't on ours yet. My husband asked a boat that had pulled up to the beach if we were next and he told my husband to walk roughly 1/2 mile down the beach to ask another boat that had the companys logo on it, so he did. When my husband walked back he said the captain of that boat said our excursion had been canceled earlier that day. At that point my husband told the other folks who were wearing orange wrist bands sitting around us that our excursion had been canceled. I went to talk to the bar "manager" and she didn't know what was going on. I asked to speak to another manager and as I am speaking to him an annoucement on a intercom that you can barely hear states "gibbs cay has been canceled". He said that it was announced earlier which was impossible as we didnt leave the designated area. He was extremely rude. At this point I had wasted our day at port, we were hungry, and we had to go back to the boat. Carnival excursion desk associates were even worse. The women said the excursion was canceled at 12:00pm that day so theres no way my family and I got on the shuttle. I explained to her that we left at 11:30am. They did refund my money for the excursion back but completely wasted not only 1 of my 4 port days but the time after having to continiously go back to the desk to wait in line to speak with them was ridiculous. My advice is spend the extra money and pick a different cruise line.