Definitely not! And any agent who says they can, they are not only lying they are also breaking the Code of Conduct (assuming they are registered!) Visas are GRANTED when the Regulations are met. They are nobody’s “right”. You are not a “customer”, and they won’t be pushed. You need to be patient.
The very worst thing you can do is to do the “I’m a taxpayer and I know my rights” outburst. And beware of any “agent” insinuating they are friends with Departmental staff who can fast-track. This is the Australian Government you are dealing with, and you don’t want to be party to suggestions of obtaining special favours from Departmental officers, as this smells of serious corruption. Even if we believed this was a possibility (which we do not!), we run an honest business and would never involve ourselves in this sort of thing. Please don’t ask us.