The ACMA is the Commonwealth body responsible for the regulation of broadcasting, the internet, radiocommunications and telecommunications. In relation to the ABC, however, the ACMA's jurisdiction is limited to matters covered by the ABC code of practice (copy enclosed).
The ABC is not required, under the code, to put any caller who requests it to air, or to explain the reasons for its decision not to do so. Further, defamation matters (such as damage to reputation) are not covered by the code. If you believe you and your business have been defamed, you may seek redress through the legal system.
In relation to the other matters you have raised: the code of practice contains requirements in relation to accuracy in factual content and impartiality in the case of news, current affairs, opinion, and topical and factual content. It also contains a requirement in relation to balance in the case of news and current affairs content.
If you consider that the ABC has breached the code in the broadcast on 3LO on 2 June 2010, you may make a complaint about the matter. Your complaint must be made to the ABC in the first instance. It should be directed to:
ABC Audience and Consumer Affairs
GPO Box 9994
MELBOURNE VIC 3000
Any complaint you make should clearly link your concerns to code requirements, ie it should make explicit reference to the code and focus on the issues that are covered by the code. In addition, if you consider, for example, that the broadcast breached the accuracy requirements because an 'untruth' was told about you, you should clearly identify the material broadcast that is of concern to you and indicate why you consider it inaccurate. The same would apply to any other code concerns you might have.
If you make a complaint in these terms to the ABC, and either do not receive a response within 60 days, or receive a response from the ABC but are dissatisfied, you may then refer the matter to the ACMA for consideration.
I enclose a brochure with further information about the ACMA's role in relation to complaints about the ABC.
I hope this information is of assistance.