Rental agreement

I rented a car to owne from Pace car rantal for ehelling for almost a year I payed R20000 deposit for the car but unfortunately I was involved in accident the driver who caused the accident was drunk driving, and reckless but their insurance didn't replace me with other vehicle I have to loose like that when i talk to pace representatives they said I have to pay other deposit of 20000 and start new contracts for other four years of which is not fair according to their contract and I never missed any payment I was paying R8400 a month I didn't missed any payment i owe them nothing