Disregard this if your products are lisenced.... but....As the others have said.   Anyone with half a brain who is copying your designs already knows you cant report them - youd only bring attention to your own illegal activity.  Its no wonder they are ignoring your emails. Ill guess they are in China, where the copyright laws are very different to ours, and what they are doing is probably not illegal (hence why we get so much fake products from China) - they will get away with it. You wont, if someone reports you to the right person.  

All those images you are using are protected by the Australian copyright law of 1968, and the international copyright treaties, and the international Anti-counterfeiting Trade Agreement (Australia included in the list of signed up countries).  Australia is required to act.

Its been in the news here recently that Disney has been cracking down on people using unlisenced merchandise (after the success of Frozen). One Amazon seller that Im aware of has been slapped with a lawsuit and their assets frozen. I know people who have lost their house and gone to jail from selling stuff using unlicensed images on tshirts etc Paddys Markets in Sydney (5 years I think it is).

Its not only criminally illegal (jail time / fines), but you can also personally be sued..

If I were you, id remove all the illegal stuff immediately... or keep very, very quite and pray no one reports you.