Hi, I paid a company for a service. I was on the phone to them and they created a PayPal button for me. After I paid them over $10,000, I found that they were not registered in Australia, had no abn or acn. They then did a dreadful job that wasn't worth anything so I asked for my money back, they won't correspond with me any longer. The woman who scammed me is an Australian citizen, however all the money goes to a US PayPal account. They have threatened me with a defamation suit if I don't stop talking about them on social media. I have a PO Box as an address and they do seminars regularly so I could easily give them court papers. The only thing is, do I sue her? What else can I do, I have already reported them to the AFP ( Australian Federal Police), Fair Trading, ASIC. Thanks.