2. Strata Managers Responsibility wrt Strata Rolls
We appointed from within the SC roles of Chair, Treasurer, and Secretary, notwithstanding that there is a delegated authority in the agreement with the strata manager.
I am pretty sure that the Strata Manager is not providing the committee with the information necessary for it to meet its obligations, unless they are informing the appointed Secretary and he is not informing the committee.
Your committee needs to clarify the role of the strata manager in writing. If they are saying they ARE the office-bearers under the terms of your contract with them, then you need to hold a general meeting to rescind that delegation and rewrite it so that they are only a back-up (which is the proper, standard agreement). Then you can examine whether or not they are properly fulfilling their duties as strata managers and deal with that accordingly.