Preparing for an upcoming overseas trip, I was going through my passport and didn't see any indication that my visa had been cancelled. I did go down to immigration and cancel it once I obtained citizenship and they assured me that they had cancelled it in their system. Is that the normal process? I have left the country with my Thai passport one time, going to Lao, and didn't have any issues. I just want to be absolutely sure before I go on my next trip from Suwannaphum.