@Lester ********
I have no idea what he was referring to. And you can only get the 1-year extension from the same province you got the initial visa from. So no, he didn't mean go to Bangkok for that because they wouldn't issue it if that's not where you got the visa.
Talking about an embassy at all in this regard makes no sense. There's no Thai embassy in Thailand. And a foreign embassy can't do anything about your Thai permission to stay.