Report then to the AFP, and the AFP will determine if there is validity in the claims by the rumormongers.
http://www.afp.gov.au/contact.aspx
Though you have added nothing to support the claim "....These fees, paid by ordinary Australians on everyday food and grocery items
directly support terrorism...".
And you are just sidetracking with your talk about the validity of the certification. (Even the "Heart Tick" has had claims about its validity.)
So why do you believe the proceeds from the Halal certification "
directly support terrorism"?
Is it just because it is related to Muslims or do you have something of substance that is beyond fear mongering and rumors.
