The Australian Consumer Law (ACL) protects consumers from unfair sales practices.  The laws cover practices including:

• Refunds, repairs and replacements
• No refunds
• Unsolicited supplies 
• Telemarketing and door-to-door sales
• Referral selling and pyramid schemes
• Multiple pricing (more than one price is displayed, but cheapest price is ignored) 
• Lay-by agreements
• Harassment and coercion
• Original packaging and receipts