Non-OA can only be applied for in your home country. Assuming you're on your initial Non-O, yes you can leave the country but you need to buy a reentry permit.
The only thing incorrect is your ability to read, comprehend, or fit your whole big ass head in the picture frame. If youre applying for a Non-O at a thai embassy in your country, you don't need money in a thai bank. Period.
If you've had 65k a month for the last 12 consecutive months you shouldn't need an income affidavit. All you need is a statement from you bank (you have to order it, takes 2-5 days). Which immigration office did you go to? Its possible they misunderstood you, or didnt care to ask the details.