Insurance claim Rejected & Incurred Debt

my mother's car was involved in an accident and my brother had taken it without authorisation. The car was towed away from the scene and we negotiated with the towing company that be no charge for storage space. Assessor removed the vehicle to SMD & the claim was rejected. We were told to fetch the car and SMD Indicated that there is approximately R10000 charge for the storage which is accumulating each day they have the car and the would not be released until the amount is paid. We have tried to liaise with them to no avail. We are now left without a car and incurring debt. Kindly look into this