Accident caused to car by showroom driver during pick and drop

I stay in Mouda near Nagpur. I own a maruti zen car. I gave it for servicing to a maruti Suzuki showroom near my place. I availed pick and drop facility provided by the showroom. after servicing when the driver was returning, he met an accident and caused some huge damage to the car. He was not seriously injured. I was called at the location. I had a third party insurance as the vehicle is second hand. I had some discussions with the showroom management. They said that approximate estimate for car repair is 94000/-. We asked them to pay 90% for the repair as there is no fault of mine for this accident. They said they will be sharing 50% of the cost. They also have a slip which I signed during pick up of the car. The slip has the declaration that says Customer is responsible for any damage caused during pick and drop. Please tell me what to do for this case.