We chose this cruise for two reasons. First, to spend time with my parents who traveled with us, and to see the southern part of South America which we had not seen prior. From that standpoint we accomplished goal one, and partially goal two. I'm a cruise veteran, having been on seven different cruise lines, for a total of 18 cruises. This was by far the worst experience we've had in 25+ years of ocean cruising. We met with the General Manager and started to explain some of our issues with Oceania, mostly their lack of communication. To my surprise he stated they were over staffed, not under staffed as I assumed with the service so poor. He explained that about 30% of the staff were new and inexperienced, hence the poor service. I also complained that the decision to skip a port was made around midnight, yet Oceania still let all of us get up early and get ready for shore excursions. I explained that i didn't appreciate them waiting until after 0700 to inform all of us. He first said the announcement was made as soon as the decision was made, to which I told him that was impossible, that we failed to turn around midnight for the next port and had sailed for 5+ hours before we got up. Once backed into a corner he got upset and barked at me, "Would you like me to call you at midnight when the decision was made?" To which I replied, we are done here. I will not tolerate a lack of integrity nor disrespect. I'm providing feedback to help your bad cruise line. Doesn't help my cause. The staff was totally unprofessional, and disrespectful. I'm the President and CEO of a company and I would have fired everyone in management of that ship had they worked for me.