I would check with your lawyer, but i would think looking at the book and the Law that if the Statutes clearly state that all of the three phases are one community then that what they should be. The statutes are the laws of the community and i would guess by signing them you agreed to join the community and abide by them.
To change the statutes needs ALL of the owners 100% to agree at the AGM or EGM. The Rules should come from the statutes, ours for example says don’t hang anything over the terrace, awnings must be of a certain colour, no satellite dishes etc etc. so we have them as rules.