You may receive better replies if you mention the name of the property.

If it is Raffles Singapore it appears there are five categories, and the offer excludes the three highest. My interpretation is that you book the lowest and will stay in the next category because they have very few of the base category suites:

-- http://www.raffles.com/singapore/rooms-suites/

It also appears that the identical offer is available through some other agencies, and you might try elsewhere if the service isn't to your liking.