I understand the confusion.
While the "Zero Out" 599 or Unli Plan 599 is "more expensive" than Plan 499, UnliPlan is considered a lower plan by Globe Telecom. As you may have noticed, the peso value for Unli Plan is only 200 compared to 499's 900 peso value.
I would suggest that you maintain your existing plan and add an UnliCall and Text Booster. You can use the 499 as consumable for your calls and texts to creatures in other networks.
Thanks for your suggestion. However, it may be hard for me to go back to my original plan since the request has been effected on my account. The thing that i worry is the pre-termination charges and admin fees for changing to plan 599. When we say pre-termination, it means you will close the account. The way i understand it, they will open up a new account for me for 599 and my lock-in period will extend. Upon verification with a globe agent, they told me that it will just be a upgrade, so I asked them why I will be charged for a pre-term fee. Also with the admin fee, the agent who processed my request told me that I will be charged of such on top of my bill, but when I tried to clarify it on my next call, the agent told me that no admin fee will be charged on my account. I got relieved on that good news, so I told them to post such conversation on the note history of account so I have a back up when it appear on the billing statement.