If you think you have been subject to workplace bullying, you have a number of options. In the first instance, it is important to report the incidents to a manager or someone else in the workplace, like Human Resources. Employers have a duty of care while you are at work, and this includes ensuring your health and well-being. They may be able to intervene and put a stop to any potential bullying before it escalates. Beyond the workplace, the union applicable to your industry may be able to offer you advice about your rights as an employee and what you can do next.
A further option that is available if you are still employed where the bullying is alleged to have occurred and you think that it is unlikely to stop is to take action at the Fair Work Commission. If the Commission agrees that you have been bullied, they can make a number of orders to prevent it, including preventing individuals from communicating or attending work, commissioning specific training for your employer about how to deal with workplace bullying and seeking legal assurances that your employer will comply with a workplace bullying policy.