How does the stamped date for visa extensions work at the Muathong Thani office in Thailand?

The user is seeking clarification about the stamping practices at the Muathong Thani immigration office in Thailand regarding a 30-day extension based on an embassy letter from the Australian embassy. There is a concern that the extensions may be dated from the date of application instead of the original date of the request, which is causing confusion. Other users are asking questions about the type of visa and suggesting that the user directly consult immigration with the embassy letter.