What happens if my DTV e-Visa application is declined and can I switch categories without losing the fee?

I'm not sure that they received all the documents on the e-visa, as when you upload a document, you can only see the last one you uploaded. I was rejected because there was no information about the job description in HCMC. This is why I'm not sure they received all the documents. I will reapply after that, but I will only do it at an embassy where you walk in.

You need to say where you apply

If you apply for DTV, and you don’t meet the requirements under the category you apply for, applying under another category will be a new application. You will pay again.

They would typically request more documentation and allow you to submit it before outright rejecting. But once rejected no refund

No chance at all. They will keep the money and tell you to apply again.

It isn't whack-a-mole where you keep throwing spaghetti at the wall until something sticks.

Well, it is, at 10,000 baht a throw I guess.

If you are using the Evisa online application system, once declined, no refund. No change in your application to another option for the DTV. Requires a New application with full fee.

yes