Why was my visa extension denied in Koh Phangan, and what should I do now?

With your history you took a big risk flying into BKK without fast track. That system-level note sounds cursed. Most immigration offices are now likely to deny future tourist extensions, so you'd be doing a border run (or fast track flight) every 60 days. Get a DTV.

You played the system and got caught.Man up and take your punishment.

No one here knows the full story and I'm sorry for your troubles. Unfortunately, in the last 2 years or so, Koh Phangan has become absolutely flooded with rude, disrespectful, arrogant, demanding, entitled people. I have been to the local immigration office 5-6 times and EVERY time there is some woman wearing only a bikini top or a guy wearing nothing but a pair of ragged shorts, loudly complaining about or demanding something. The word "respect" doesn't seem to be a part of their vocabulary. The very fine men and women who work there have been shit on so often they are getting tired of the visitors trying to game the system and/or demanding a stamp. As a result, everyone suffers. Koh Phangan was very fortunate to even have an immigration office open up here. Just my 2 Baht opinion.

Don't waste your time, you showed a return ticket for 60 days later.

The IO denied your extension based on that and on your pasts runs and extensions.

You are now flagged in the system. I doubt any of the Immigration offices will grant you this extension.

You played with fire, and now you have to face the consequences and comply with the Thai regulation.

As you've been told: leave and come back with a proper visa.

Seriously don't waste you time trying an extension like you said it is noted in the system your obviously have pissed someone off. Leave and apply for DTV it's 5 years you ate living here anyway. So take the stress off yourself get a ling stay visa problem solved.

That is a strange story indeed.

I have heard of passport control asking for proof of onward travel (that is actually an entry requirement IF they want it to be)

but

I have never heard of them putting a note "in the system" OR looking at your previous entry stamps and saying you couldn't border bounce out/back the same day <- which you can with a service (like you did) because that service pays the border to get you out and back.

Plus the previous time you were here you were using free stamp entries when it was only 30 days NOT when it was 60 day entry (and the borders weren't telling people to stay out overnight).

Really sorry that happened 🙁 Definitely go to Samui <- although they're only slightly less of a renegade office than the one down there on the Island of Misfit Toys (aka Koh Phangan). 😮

Try Samui, if they say no, you could even go to the main office of that province Surat Thani and try there,

BUT

if they won't let you get one, then use a border bounce company down there to take you to the border and back.

Again sorry that happened, sincerely good luck with it, report back if you can about how it goes at Samui..