Jitae929 the S/S letter will neither get accepted by any Immigration office, nor will it get accepted on the consulate in Savannakhet. He is travelling to Laos for nothing, he will come back empty handed. That's why he was correctly advised by
@Gregor *********
to put 800,000 THB into his Thai bank account ASAP, exit Thailand and re-enter visa-exempt. Then apply for the "change of visa type" based on these 800,000 THB already sitting in his Thai bank account. There is no seasoning required at this point. The 2 monthsseasoning is only required when you apply for the 12-months extension of stay