So this year I went to Florida with my family for 2 weeks. We were all tourists and we go to the US almost every year and have no administrative problems usually.
This time, however, I recently received a warning that I have to leave the US within 10 days or otherwise I will overstay my visa. But I left the country long ago, with my family, on the same plane at the same time after our 2 week holiday. The rest of my family has been registered to have been left the country though.
My problem is, although I could maybe prove with the help of the local police that I am indeed not in the US at this moment, I can't prove when I left the US or how. I have no stamp in my passport, they haven't done that in a long time. The airline can't give out the data that I boarded the plane. I don't have my boarding pass anymore.
There is no way I can prove that I legally left the US, only that I am not there right now. What should I do? I feel this weird error could get me in trouble the next time I enter the US.