WATCH THE FULL INVESTIGATION ABOVE: Reporter Marty Smiley meets the refugees, migrants and international students speaking out about rampant underpayment.
The first time Jonathan was offered a part-time job in Sydney, it came with an hourly rate of $12.
"There was a small supermarket owned by a Chinese couple -- they told me that they could pay me $12, and they said that's the average," Jonathan said.