Yeah you go to IT Square Laksi. Believe you me it is a much better place than Chaengwattana. The mall is old but the imm service at counter K is great. I was there yesterday extending my 45 day visa exempt entry. Arrived just before 10am all finished by 10.38. Go early as they only process 300 a day and even though the mall doesn't open until 10am the lmm office opens at 8.30am on Level 3