You can delete a device in the app and just use the new detected device = your new phone. It's in Settings, under "Device management". Get it? How do you think I'm doing it when I'm buying a new phone? Do you think I'm visiting my branch?
Really? Then you haven't read about complaints about Korat immigration. Yesterday was the last time from a guy who had to wait 4-5 hours until it was his turn.
You need to find a place to stay, get a residence certificate from immigration, a hotel address is officially not accepted, open a bank account and transfer those 800k within 30 days.Those 800k has to be in your account 2 months prior to the day you apply for the 1 year extension.