Accused of noise in road traffic.

Hello dear motorist, I hope I am here in the right forum. Here my situation: Today my father received mail from the police, a summons as accused because of noise in road traffic. There was neither a direct action (way of driving or similar) nor a place there. Only the time , on 28.05 at 4:20. There was me and my parents very quickly clear, that can only have been me. Since then I break my head, what I did at that time. I have already asked many friends t and no one can help me. Because I absolutely can’t remember being on the road this morning. I’m not driving around alone at this time! And I wasn’t traveling with any of my friends either. Besides, at this time the brake light switch on the car was broken, which was only fixed the following Thursday. That’s why the car was basically on the yard in the dark. A bill of the workshop is available in the rest, which proves however only that the brake light switch was changed on 31.05.. In our city (a small town ) still a car has its own model series , even color around that differs in the license plate only by one digit. Maybe there was a misconception? Even if I was on the road at this time, I am no one who provocatively drives because my driving licence is far too important to me. Has anyone already had experiences with it?