my experience with Sydney consulate is that they don’t answer emails 🥲
Yes the Thai course people have been great with following up to see how my application was going, and whether I needed any other help. Having a refund policy gives people more peace of mind.
I think some people may have been rejected for reasons other than the course. Eg the embassy has reason to suspect that they’re working in Thailand.
wish you all the best with your application in Sydney. Yes I sent all pages of the bank statements with nothing blacked out, so it looks genuine. I used Smallpdf to compress the file online.