Not happy with panelbeater time run-over thus affecting me

In every project there is time frame and penalties if deliverables are not met. My car claim was approved and instructed to the panelbeater to start working on the car in less than 2 days from the day of incident. 30 days later courtesy car must be returned. I asked myself is myway not interested in what the client is driving while there is extension in time frame to fix the car. Myway in my view since their supplier(Panelbeater) failed to accomplish the work on time. They are supposed to arrange extension or in their agreement with Panelbeater they must put car own 's interest before everyone