Hello, I went with my American friend to Samut Prakan Immigration to extend her visa free entry for 30 days. After handing over her passport to the officer we learned that the immigration officer at Suvarnabhumi gave her the wrong stamp which gives her 90 days instead of the expected 30 days as pictured below. The person at the desk in Samut Prakarn told us to go to the airport to get it fixed and insisted that she cannot actually stay for 90 days.

So I have two questions, is this stamp valid for 90 days? If not, where would we need to go in the airport to get the correct stamp?

Thank you in advance.

Just a gentle reminder peeps to just check your stamp when you enter through immigration. I just got stamped in for one month when it should have been 3. Simple mistake and got fixed straight away.