unfortunately it has been the case for many years that some phone reps do not know what they are talking about
That is why I never call Oceania I get my TA to find out the answers to any of my questions
Figure out how much you drink outside of lunch/dinner wine/beer package then you can see if the $30 PP PD is worth it to you or just pay as you drink
you do not need to upgrade as soon as you board you can take a few days to see how much you actually consume then decide
JMO