From your description, it seems you have been adversely affected by the common property addition.
And you possibly have a case against the OC.
However it’s not as clear cut as pointing to a section of the act and getting relief.
You should engage a good strata lawyer to advise you. If you decide to pursue this action, then it’s probably going to be an expensive exercise because of the technical nature of the dispute.
As a matter of interest, what outcome do you want?