Need 500,000 baht in your account for a period of 3-6 months shown with statements in a personal account in your name and available to you for living expenses
I think they know your application isn’t legit, being on a retirement visa and switching to DTV is a red flag and mostly done to avoid the 800,000 baht deposit requirement etc - most embassy and immigration are aware of people trying to switch to the DTV from other visa class