Happened to me years ago, unfortunately for me their friends were following in the car behind them when they cut across me coming the opposite way at the traffic lights. They claimed the light had turned red which was bull as it was still green after I ploughed into their passenger door. Their friend behind got out & said see you back home & everyone buggered off while I called & waited for the police. Six months later my insurance company paid up claiming they had two independent witnesses, one of which was their buds behind.
Sometimes you've just got to suck it up & get on with it but I was bitter about it for a couple of years after.