Most scams operate online. But you're not the first and you won't be the last! I'd be lodging a disputed transaction with my credit card provider and requesting a chargeback
No it doesn't. Unfortunately many believe it's a "one size fits all" situation, which is so far from reality. Even with 180+ days in the country, certain DTAs can allow a dual tax resident to have sole tax residency in another country. There's so many clauses in the various DTAs which stop certain remittances being non-taxable in Thailand. The only people required to complete a tax return are those with assessable income
Yes the Satellite terminal has been operating for quite a while. I find it pretty good in that, although you have to get the train, it drops you directly in front of immigration. Saves some of those long hikes along travelators being blocked by people unable to keep moving
If you have a pension plan from your super, it's not taxable in Thailand. Many Australians also retain Australian Tax Residency and a "permanent home" in Australia so can be deemed solely an Australian Tax Resident, paying nothing in Thailand. As with any tax regime, there's legal ways to circumvent!