What should I do after my Thai visa application was cancelled due to wrong personal information?

The post discusses a user's experience with their visa application being cancelled in Hanoi due to incorrect personal information (specifically a missing hyphen in a double-barrel surname). The user seeks clarification on the differences between 'cancellation' and 'rejection', whether they can reapply immediately, and if they can get more detailed feedback on the application issue. The comments provide insights from others who have faced similar issues, suggesting that cancellations often stem from small errors in personal details, emphasizing the importance of ensuring all information matches exactly with the passport. There are also suggestions to verify and double-check all entries before submitting the application.