Sponsor letter normally refers to dependant’s who are family members of somebody already got a DTV. You can’t expect a child to have a bank with 500 K. That’s why it states that the DVT holder needs to be responsible paying their living costs.
If you husband got a DTV without money in bank - but with a sponsorship letter stating a relative will foot the bills - then that’s different matter.
If that was the case think embassy didn’t interpret the rules correctly and you got lucky.
Don’t believe this post - DTV VISA you must have proof of 500k baht in bank.
Cannot believe any embassy would except a sponsor as proof of funds bull 💩 😀 - every man and his dog would be applying for a five year visa with no income if their own.
ive already advised to open a "Thai" Currency Jar...so your wise account is in baht.....you can then pay using QR codes ....which is what a thai bank account allows you to do....should try it ....its dead easy...