Terrible driving by Gautrain bus drivers

This is like the 3rd time I'm experiencing bad driving by a Gautrain bus driver. This happens on my way to work using the M1 highway from Allandale road. These flippin drivers will drive behind you and actually flash their lights for you to move off the road and this blinds me from even seeing their number plate. They change lanes as if the're driving a ****** BMW Z3!! I'm just lucky that nothing has happened to me thus far. I sure hope Gautrain does something about this.