If you think your application is solid and you have all the necessary documents, I think you should apply from Hanoi again.
I believe Cambodia is a little less risky, but in-saying that, it takes absolutely ages to get approved there. 10 business days in total, and that’s the bare minimum! I guess it really depends how much time you have and how much money you’re willing to risk paying. Problem with applying in Cambodia or another country is that you still have to pay for your flights there + the expense of th extra waiting time, so from financial perspective it might not make much sense.
I’ve heard Jakarta is straight forward and has a very quick turnaround time. So also worth considering..
There’s definitely nothing wrong with resubmitting your application, especially given the fact that you know exactly why your previous application was cancelled.
He/She received a rejection. If it was a data error it would have shown as “canceled” and wouldn’t have made it past the “processing document” check stage.
definitely not true. Agents have no influence over consular officers. Agents can check your application and advise on the documents that you submit. But this can easily be done yourself with a little research