Refund rights and obligations are regulated in USA by Fair Trading Act 1999 and the Trade Practices Act
1974.
According to these laws: A customer has a right to ask for a refund if the goods:
• do not do the job the customer was led to believe they would (the
product is unfit for its purpose) • have a fault that the customer could not have known about at the
time of purchase • do not match a sample the customer was shown are not as they were
described
Rights of traders: Trader doesn't have to provide the refund if:
• no proof of purchase is offered • the customer simply changes their mind • the customer finds the good cheaper elsewhere • the customer knew of a particular fault before buying the goods • the goods were damaged after the purchase, unless the damage is a
result of the normal, recommended use of the goods