The strata manager is the agent for the Owners Corporation, taking action on the instructions of your strata committee. Are you and your fellow owners concerned about fire safety on your committee? If so, instruct your strata manager to obtain 3 quotes from 3 independent fire safety companies (or find some yourselves), and then pick a better one for next time. If not, add a motion for the next strata committee meeting to do this, or add that motion to the agenda of the next general meeting for all owners to decide about.
If your strata manager is from a “vertically integrated” strata management company – ie, the strata management company, the fire safety company, the contractors, etc, all have a financial connection (owned by the one entity), then this will be resisted. Perhaps look at changing strata managers then, to an independent company, if freedom of choice is important to the owners…