Sharing my experience, might help someone else.... went to extend my TR visa today....recently moved to Bearing not too far from old address at Udom Suk. Went to Chang Wattana got to be stamped and the lady said I need to go to Samut Prakarn....proper ball ache!! At Samut Prakarn now but if this can help any one moving forward then happy days. Check which province you are in....my road is literally on the border