I don't understand why you ladies let this kind of stuff go. Women have a lot of sanctity in official eyes. The police are just waiting to pounce on men who harass women.
Someone attempted to harass my wife once; a license plate number was all it took to end the matter.
Don't waste time. Report the matter. One day one of these guys will really get out of hand and, then, wouldn't it have been better to have stopped him earlier on?