Thanks for the reply.
I should have pointed out that I do not have collision coverage on my personal car.
My own insurer is therefore of limited help.
I realize that ultimately I might have to pursue this directly with the driver, but was wondering whether the car owner (Enterprise Canada) is liable and to what extent the driver's having violated their contract and being negligent makes a difference.
So far, I've had a run-around from Enterprise and their insurer (Chubb), with no one having started a claim.