You may need to consider using an agent. The fact you actually have 800,000 bht in your account when you apply for your extension will help although will still cost you. Better that than have to leave thailand and return. Make sure you abide by rules for following year then no need to use an agent again.
k to 65k rule at jomtien immigration. When my renewal was due i took 12 month evidence of 65k per month for previous 12 months. Informed immigration officer i want to switch from
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k to 65k rule. Immigration officer not interested in the previous 12 months of evidence showing i could comply with regulations. I also had evidence of pension salary. Again not interested. Told me to produce this evidence in 12 months when i come back to do my next extension along with bangkok bank statement showing the monthly international transfers into my account. Was not given date to come back to show i had complied with 800k in bank for 3 months as is the norm at jomtien immigration.
- according to immigration guidelines, if a person can show embassy affidavit confirming the are on a pensionable income of 65k (or more) then they can use the 65k option. I am a UK citizen so i used the