Make a booking wherever you are and you won't have to wait. Remember also they may request TM30 to ensure you are at the immigration office which aligns with your registered address
He can extend himself. Doesn't need an agent. What he's talking about is the second "free" year you get with the OA. He's missed the boat. No agent can fix that
The visa is done so no more entries on it. You won't get the free second year now. If you don't want to put the 800k in the bank you'll have to go back to your home country and start again
In fairness if you're asking a question it's best to be clear what you're asking about. Some people go to get a non-O 90-day visa. Problem is so many people like to play guessing games
Actually it's RTP, and as for the Immigration Bureau having a voice of its own, stop kidding yourself. Every statement from the Immigration Bureau comes through Surachate ("Big Joke") who just happens to be Deputy National Police Chief. And you reckon I don't understand basics? Wow!