My husband and I also went into Hua Hin immigration today. They stamped our passport with a new visa stamp which will expire on the 26th of September. We paid no fee. We had all our paperwork prepared for an extra 30-day extension because once again our flights have been canceled. They told us to come back on the 26th of September (which is a Saturday and they are closed). In reading back on official statements by the immigration office, they state we must come in before 26th to apply for an extension.
I received an email today in regards to a 30 extension letter with a link to request one. Within an hour the embassy emailed me back the letter to present to Thai Immigration. Haven't made it to the immigration yet.