the day thai banking rules start making sense is the day dragons will appear in the sky and start squirting vanilla coke on everyone with green shirts on.
The issue was people who paid agents for f@ke education visas. As in the visa was real but they didn't go to school. It was all bribery and f@ke documentation.
Yes, you can come and go as many times as you please. You could technically enter the country 300 times in a year and it wouldn't be an issue (but your passport would be full of stamps 😅)
odd. They're the ones who issued the visa. I hope they let you in when you get here. If they ask, just explain what happened.
And for future reference, just write your name without a hyphen when dealing with Thai authorities. Keep it simple as they already complicate everything on their end.