What should I do after being denied entry to Thailand under Section 12(2)?

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It looks like you've already spent 180 days in Thailand this year, and possibly some more in the latter part of last year. You simply can't live in Thailand on tourist entries any more and immigration tend to look back at your history over the past 12 to 18 months. Get a visa that suits the purpose of the time you spend in Thailand, and I don't mean a tourist visa, otherwise you are at risk of being denied entry again.

I would stay away for 180 days before returning. That would look nice to immigration and get a 60 day tourist visa too.

Why do you keep coming here, obviously not a tourist.

It you want to live in Thailand get the proper visa

The Thai embassy and Immigration are not the same. The embassy issue visas on behalf of the Ministry of Foreign Affairs and I assume that they do not have access to the same systems used by Immigration.

Immigration are an arm of the Police and enforce their borders. They will see your visits to Thailand. Having a visa doesn't guarantee entry if you fail to meet the requirements of Immigration. I suspect your amount of time in Thailand is the reason you have been denied entry and it is possible that Section 12(2) was used as this may be the easiest course of action for them to deny entry.

In short I doubt a return visit to Thailand in the very near future would be successful regardless of having visa.

At Phuket Airport during July 2026, were you Making Entry into Thailand on free Visa Exemption Entry stamp « ผ.60–ม.17 » , Visa on Arrival (VoA) « TR–15 » , or, did you already have a Single Entry Tourist E–Visa (SETV) PDF File Hard Copy Printed out on Paper issued by a Thai Embassy or Thai Consulate outside Thailand??

if it was free Visa Exemption Entry stamp ( ผ.60–ม.17 ) or Visa on Arrival ( TR–15 ), then perhaps getting a SETV beforehand from a Thai Embassy/Thai Consulate might help out, but, as always, Entry into Thailand is at the Discretion of the Thai Immigration Officer

I can't comment as you said you wanted someone with experience of that situation. I always get the visa that's appropriate, whereas you cant be bothered

Strange if you had the money I don't know how they stopped you. Also pay for fast track

I think your chances to get in again now are very low I think you shall need to wait a year after your last visit Officers are looking for that you stay 180 days or more days in Thailand in a year or even a year and a halve The TM.35 in your file will not make it easier. You can try to enter again with a visa, but even if you get the visa it will be not sure you can pass immigration.

I suspect you made the denial of entry easy by not having the required B20k in cash *any major currency) as required by Thai law