Hello, if you come in with 2 months visa, and if you want to extend another month, you need to go chaengwatnna immigration and not IT plaza Laksi. You need to print out Tm30, you can ask hotel print out for you. Not to forget to photocopy your tourist visa and entry page, passport front page, 1 photo and fill up 3 forms at immigration and finally 1900 baht. I just got extend few days ago. I went to IT plaza and they ask me go Chaengwatanna because I came in as 2 months tourist visa. Hope this info help you. Have a nice day.
P/s you can check in any hotel in bkk as long as they have and can provide Tm30. Some hotels don't.
Did they ask you the same question repeatly... Sir.. Why you stay in my country more than your own country? Why you no take visa. Why you stay in my country more than your own country? You see computer print out the file all you sir. Why you stay in my country more than your own country?