Fees on postage came in in May 2014 from memory. Plenty of people made reports to the ACCC, but nothing happened. What they are doing is not illegal. It was run by the ACCC long before it was implemented and they approved it.

Do what most other sellers do. Add extra to your buy price, or add a bit extra on the postage. I charge $8.20 for $7.45 parcels and have 5 stars for postage. Therefore, it obviously doesn't bother the buyers.