What is your actual question? Ask that. Because if someone comes here and just says "yes" that answers your question but doesn't help you. So ask what you actually want to know and save everyone time.

There's no such thing as a non-immigrant multiple entry visa, especially not one that's valid for 6 months. There's a multiple entry TOURIST visa that is valid for 6 months.

The embassies have not sold multiple entry non-immigrant visas for more than a year at most embassies. Non-immigrant visas are only available in single-entry 90 days.

Or you can just go without a visa and enter visa exempt and receive 60 days, apply for a 30 day extension. Then do a border bounce and get another 60 days and extend for 30 days. This is the exact same thing you would have to do with the multiple entry tourist visa, except you don't have to pay $325 per person.

Malaysia fast? 😂 Expect a month at minimum. And multiple requests for documents you've already sent in 2-3 times

Non-O visa based on what? Left while you were on the initial 90 days or while you were on an extension based on the original non-O? You're not giving any information in which to answer your question.

Also there is no 30 day tourist visa.

You shouldn't need a pension letter to use deposits. The bank statement is the proof of the income. There are a few scattered reports of immigration offices asking for proof of where the funds came from, and in that case you could show the pension letter. But normally it's not required, and would not need to be translated in either case.

You go to the bank and request it and pay for it.

You will likely need to cancel your language school extension and then leave Thailand and apply for a new education visa, as you are switching from informal school to formal school.

The only people who can really answer this though would be the university and your immigration offices, since both of them would need to support you switching your extension from not only one school to another, but one education type to another.

As long as you'll be back before October 11th to apply for your extension, you can get a re-entry permit. But you can apply for the extension 30 days ahead of time at most immigration offices, and 45 days at some. Which means you might already be able to apply for the extension. Why wait?

There's nothing to fix. You receive the 90 day stamp you were supposed to receive, and your stamp indicates you entered on a non-O visa, which you did.

When you go to apply for an extension, you will have to give them a copy of your visa. That will show that it was a visa based on marriage.

@Ken ******

You're talking about something different. The visa is valid for 90 days. That's how long you can use the visa. Once you enter within that 90 days, you get a 90 day permission to stay stamp. The visa is no longer relevant because it was used to get the permission to stay stamp.