Your whole post is just a bash.
Folk were caught out by the sudden change in border bounce "rules"
The OP experience along with others are outlined in this thread
https://aseannow.com/topic/1347328-nong-khai-border-bounce-avoid/
Previously Nong Khai had zero issues for same day border bounce.
People were blindsided, simple as that.
@thai006, disregard this posters bash I quoted.
Back to you trip to Thailand next week relax you will be fine.
Have the onward flight as a print out + funds etc
If you do a border bounce this trip then use a border run agent.