The IFDAA's website includes clear information about its complaint handling process. There are forms you can fill in and a number you can call if you have a question. Your complaint must be put in writing though.
Other information which may help you with your complaint:
(4) National Funeral Directors Association (NFDA)PO Box 793 Bendigo Vic 3102
The NFDA is a nation-wide network of funeral directors.
Member firms must be 100% Australian owned and are all family owned and operated.
NFDA members are required to adhere to a Code of Ethics here (scroll down)
Phone - (03) 5443 4455