I reckon submitting this form and initiating an IMMEDIATE chargeback are the best way to deal with some of these group buying companies and their business clients, providing you reside in WA or the business is in WA.
http://www.commerce.wa.gov.au/ConsumerProtection/PDF/Forms/C…
Good work. Hopefully people will use them if they don't get a satisfactory response from the companies.
Other links:
VIC: http://www.consumer.vic.gov.au/CA256EB5000644CE/page/About+u…
NSW: http://www.fairtrading.nsw.gov.au/About_us/Online_services/L…
QLD: http://www.fairtrading.qld.gov.au/make-a-complaint.htm