you're in a different situation as your embassy won't provide an income certificate so you use 65k baht per month transfer option. They were looking for confirmation of where they 65k came from. It's not unusual
There are a number of different visas all referred to as retirement visas.
The most common is the 90 day Non-O visa which you should get before travelling to Thailand, then you need to open a Thai bank account and put a minimum of 800k baht in it, the money has 2 be in place for 2 months before you can apply for a 12 month extension of stay, must remain there for 3 months after you get the extension of stay and not drop beyond 400k baht at any point in the 12 months.
Alternatively there is the Non-OA visa which is a straight 12 months multi-entry visa again applied for in your home country. This doesn't require you to put any funds in a Thai bank at all but does require insurance, police checks, etc.
The other options are not worth listing in your case but feel free to Google them.
You need to get a confirmation of overseas transfers from Kasikorn. All Bangkok Bank can give you is what you have which doesn't help. Look at the Wise FAQ for THB transfers