tip for your covid extension.
i just did my third one and had massive problems. in the end it got solved and i got it but took like a total of about 14 hours over a period of days.
reason for it was apparently that i did mine previously on koh samui and than changed my location to nong khai/ isaan ?!?! and the officers even called surat thani and bangkok to confirm.
if you can do it.. always do it in the same location to avoid any problems.