You can do it when you land also. I normally do it after Iโve checked in and killing time at the airport before travelling to Thailand ๐น๐ญ ๐๐ฝ๐
Sorry my last message wasnโt clearโฆ I meant you should write an explanation to the consulate/embassy that you applied from to explain why you are cancelling the DTV.
But yeah to be fair mate I figured as much that the only reason someone would switch would be because of the banking headache that has started