It sounds very much like an illicit land grab and if so, the next questions are
1) what do you want the outcome to be and
2) how far are you prepared to go to achieve that outcome?
Complain to the committee and/or strata manager? An EGM? Action at NCAT? Either of these could make an enemy for life of your neighbour but that’s not necessarily a good reason for not taking action.
Over to you.