For ease of reference the ACL is attached:

Australian Consumer Law

Tenzin and Lobtse are Mongolian students studying at an Australian university in Melbourne. Under the terms of a student visa they are allowed to work for 40 hours a fortnight. They both sign a contract with Kleen Cleaners and begin work cleaning toilets in a 10 story office block in the CBD. Two months go by. They have not been paid at all. They speak to the manager who informs them that under the contract they signed, they agreed that the first three months was a "training period" for which there was no payment. Tenzin amd Lobtse consult you. It is true that the contract does in fact contain this term but (a) they did not read it (b) they received no training during that period. Please advise them.