removing my car

I have been in accident 2 house in front of my house - the ambulance arrived and then all of a sudden 2 tow trucks arrived, first i told the tow truck person that i don't need a tow truck because the car is drive able and he insist that they are going to take the vehicle to a place where they can fixed it for not more than R5000. Monday they my phoned and told me that I am owing them R11 500.00 for strorge fees, for what? i told them no where did i sighed for that amount - let the management phone me - me before i will go to the small claims court and the onbudsman