You do not go to the main immigration office at Chaengwattana to get a 30 day extension on a 60 day visa exempt entry stamp ๐ฎ
You go to the immigration office located at IT Square Laksi Plaza for that extension
You need a new TM30
This is a list of the documents that can be required for the extension
There are copy/photo shops next to that immigration office
Here is the location
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