And as adamant as your lawyer may be what I can say is he doesn't know his ass from his elbow about getting a yearly extension of stay based on being over 50 using banked money.
It is exactly what
@Pe***
quoted (y) ;
the money must be in your account for 2 months prior to you applying for your extension, it must stay in the account for 3 months AFTER you get your extension and then the balance cannot drop below 400K baht the rest of the year.