I got run over from behind by an MTA bus in New York several years ago and the bus driver drove away. I called the local police precinct (non-emergency line) to report it with the bus number (the 4 digit one on the back) and they repeatedly hung up on me when I told them I was run down by a city bus who drove away.
What do you mean you got run over from behind? When I picture that collision the cyclist would be killed or horribly injured. Certainly not able to call the police - and if able to call anyone they would probably call an ambulance.
I'm not doubting you, just confused by the way you've stated it.