Nice report.
Regarding the bit I quoted, the timetable is currently showing buses every hour on the hour from 7am until 9pm. There's normally a sign at the booking desk saying what time the bus they are currently selling tickets for leaves and it may have just been that the one (or two) before yours was sold out already.
If you're prepared to take the risk of losing out due to delays etc you can book on line in advance for a 25 baht booking fee. maybe even book a later one and try to change it if there's an earlier option for another 30 baht fee.
There used to be a method to force the Ava chat bot to pass you onto a human.
1. Type "Change email"
2. Ignore the next few responses until you see "Talk to Allstar". Click on this.
3. Enter the details requested.
4. You'll be put in a queue to chat with a human.
Try this and let us know if it still works.
It's from secretflying.com. Redirects to skyscanner which shows Batik air on the outbound from DMK with a >6 hour transit in KUL, and Scoot on the return to BKK with a > 12 hour transit in SIN, on the dates I saw.
I've been on numerous Nakhonchaiair buses, most recently last month from Mochit to Kalasin and never experienced loud music. From what I've read, the loud music buses are normally local services.
If by OTA you refer to an Online Travel Agent then they aren't responsible for Google maps. Anyone can add a place to Google maps and it doesn't have to be checked to a great degree so there's lots of errors.
If you name the place you may get more informed responses.
The co-owner he rents from is his landlord surely, and it sounds like that co-owner hasn't paid his mortgage (loan) and the bank is in the process of repossessing the condo?
Not Thailand focussed, and written by an American I think, but this might be helpful for those needing an onward ticket in the future.
https://www.visatraveler.com/blog/proof-of-onward-travel/
You can go through fast track security and then pass through the door between the two areas to access the auto gates, but probably little, if anything, to be gained by this.
That information is probably contained in the Common Reporting Standard that both nations have signed up to so of course the Thai government will know. Whether they do anything about it is another matter.
Not entirely a waste of time as it guarantees you a seat on the bus you have booked. If you wait until you get there and join the queue to buy a ticket it could sell out before you reach the front of the queue.
It was a waste of 24 baht booking fee however as it could have been booked direct with Roong Reaung for 141 baht all in. You would still have to queue at the desk to get the "real" ticket.
https://rrcticket.com/customer/Webhome
Follow my link and you'll see the three sub-forums and below them all the regular threads.
If you alert a moderator to your OP here they can move it. Hit the report button to alert a moderator.
Those are sub-forums within the Health and Medicine forum. You should ask a mod to move your thread to the more general forum.
https://aseannow.com/forum/23-health-and-medicine/