Bad driving

I tried phoning the customer care line, a lady put me through to someone...but was kept on hold for 10 minutes... so now the internet is my only option. On 10 December at 22:00 we were driving back home from a family gathering. In front of us drove a car swerving from side to side, obviously drunk driving. I saw that the car was branded so drove closer to see what company car it was. When I came closer the car started breaking and the passenger hung out the window throwing us the middle finger a few times. On the back of the car was a customer care number so we phoned it and it was a Regent customer care line. They then sped off stopping at the next bar. The number plate: DP 99 GK GP. They are endangering other people on the road while giving Regent a very bad name.