If a visitor visa is refused, you can request for a reconsideration of the refusal.  However, a reconsideration should refer to documentation already submitted before the refusal and only rarely should new documentation be part of a request for reconsideration.  There is also the option of seeking redress against the refusal at the Federal Court within either 15 or 60 days of the refusal depending on the location of the officer who made the refusal.