Thailand visa exemption extension

Hi,

Due to unforeseen circumstances—a earthquake in Bangkok—I couldn’t get my visa for Indonesia in time, and my Thailand visa exemption expires on April 13. I’d like to extend my stay in Thailand by 30 days so I have time to apply for an Indonesian visa, as the procedures are on hold until April 8 due to the end of Ramadan celebrations and Nyepi (Bali).

I’m currently in Prachuap Khiri Khan and would like to know which is the nearest immigration office that can extend my visa exemption?

Just to note, I’ve heard conflicting info: it seems there’s an office in Dan Singkhon and another in Hua Hin. The first one is much closer—could someone confirm if it’s still operational for this kind of procedure, or do I have to go all the way to Hua Hin?

Thanks in advance!