It sounds like Ron Fernando understood quite well what Carnival requested, presuming they had his sailing information pulled up. As he stated "carnival asked us to call them back at the end of March to request a full refund. And advised us <to> call back as Carnival has not set the protocol for this sailing until after March". Sounds like he did just that.
I definitely think they're playing games right now. We're dealing with disembarking vaccinated vs unvaccinated. It's inconsistent B.S. and a chance for money grabs...but that's a different topic.
Good luck Ron!