Upvote:3
Lacking the relevant information makes answering this difficult.
If you were in Transit:
Since the burden of proof lays with you, retain the ticket proving that you entered and left that airport. If you have an entry stamp for the another country you traveled to will also help (Remember to mention that on your next entry and they ask questions about this).
If you just sent to another gate to enter
If both of the scenarios don't apply