Was the Chairman chairing the meeting, or only step up when the motion regarding changing strata managing agents came up? As it is the Chairman’s role to preside over meetings and make determinations regarding procedure one would expect that whoever was occupying that role for the meeting should have called everyone to order, or adjourned the meeting to another date if the owners would not cooperate.
Many schemes only have an AGM each year, no other general meetings. If the strata managing agent is to be involved with organising an extra general meeting it can get quite expensive, particularly if there are many owners or a venue has to be arranged.
For smoother running in the future, in cases where it is proposed to change the strata managing agent it is better to obtain sufficient votes in favour beforehand and also have a replacement strata managing agent lined up if the agreement is close to expiring. The motions for the meeting could then include one to appoint the new strata managing agent, with a copy of their proposal/contract attached to the agenda.
Admittedly all easier said than done.