Developer demands vote in sales contract

I have an issue in my strata block where the developer has made additions and alterations to common property without approval.  I raised objections however subsequent unit sales have had terms inserted in them that indicate the owners acknowledge and support the alterations.  

Legal action for breach of contract has been threatened against other owners if they do not give their support at an upcoming EGM to validate the alterations and additions.  Due to their not wanting to enter legal dispute, it is likely the motion will be voted up.  I think this is utterly ridiculous and want to contest it.  What is my best approach to take?