Anna bought headphones (priced at about AU$120) from an online store. Two months after purchase, the sound in the right earpiece disappeared. Anna wrote an email to the online store, described the problem and asked to exchange the headphones. The online store suggested that Anna send the headphones to their address (they sent her a self-addressed envelope for this). After the online store received the headphones at their address, they said that they should send the headphones to the supplier. Two weeks after receiving the headphones from Anna, the online store did not take any action other than notifying Anna that it had sent the headphones to the supplier for diagnostics. Advise Anna what rights she has in this situation. Important: reference sections of Australian Consumer Law and relevant court cases, if applicable.