Thanks for the DTV E–Visa Fee Payment information!
Was hoping you were able to take advantage of the benefits of the Bilateral Visa Fee Exemption Agreement between Singapore and Thailand, like Malaysia and Thailand, but, unfortunately, apparently the DTV E–Visa Fee is excluded for Singapore!
There are real consequences that have nothing to do with Thailand, Thailand MFA, DCA, or the particular Thai Embassy/Consulate where a Thai E–Visa application was submitted, such as first-party fraud, chargeback blacklists for false chargeback claims, and credit score damage from false chargeback claims, but again,
Recent Paystubs showing full name and current address;
Current Lease Agreement /Contract of current location, or Recent Mortgage Payments of current location;
probably easier to ask in this Facebook Group: "if i have a/b/c document, then has anyone used a/b/c document as proof of address/location, etc. etc."
You will be providing Recent Bank Statements for that 500k Baht, and hopefully, has the same address as your current address, but doesn't necessarily have to be (up to the specific Thai Embassy/Consulate, even Thai Consular Official reviewing your Thai E–Visa application)....
Well, for the many years, decades even, of the have stayed and are staying in Thailand on Marriage Extensions, Retirement Extensions, Taking Care of a Thai Citizen Child Extensions, etc. all (nearly 80) local Thai Immigration Offices are very specific and precise about the minimum amount in a bank account (400k Baht, 800k Baht) for minimum and specific periods of time (seasoning of funds) in usually one(1) single bank account (e.g. if a joint name account, then usually Double the minimum amount would need to apply)....
Thus, not surprising that the funds requirement was rejected because of using 2 bank accounts, instead of one single bank account....