ubonjoe

Mine certainly do not have a signature on them. This is the bottom of last page (5 pages total) of the statement I got in August of last year.

You can get a single or multiple entry non-o visa at the consulate in Ho Chi Minh City. You apply thee morning of one day and and pickup the next afternoon. No financial proof is required. See: https://hochiminh.thaiembassy.org/en/publicservice/non-immigrant-o-accompanying-thai-spouse-and-family-members?page=5d80ab3315e39c2fe800a791 You will need to make a appointment for the application according to the above info.

The info shown on the LA consulate is not correct. You cannot rely on any info on a embassy or consulate website for info about extensions of stay issued by immigration. You will have to prove your income by showing transfers into a Thai bank from abroad to prove your monthly income. Some offices may accept 2 or 3 months of transfers for the first ever extension of stay application but many will want 12 months of transfers. Until 2019 you could of done a affidavit at the US embassy to prove your income but they stopped issuing them in December of 2018.

In what way have they abused them? They must of qualified for them under the written rules or they would not of been issued.

It takes a week or more to get a one year bank statement unless you are in Bangkok. I have gotten one year banks statement form Bangkok Bank here for the past 3 years and none of them were stamped or signed by the bank when I picked them up at the local branch.

It seems you did not update your bank book on a regular basis. To be safe it might be wise to get a 2 or 3 month bank statement as a backup to your bank book. They can do one while you wait for it. Just request it when you ask for the letter from them.