Poor service

I recently had a very bad experience with Discovery Insure. I had an accident with my vehicle, which was sent for repairs by Discovery. The repairs were not completed correctly, and the vehicle had to be returned for the work to be completed. My policy makes provision for a rental vehicle while my own vehicle is being repaired. The repairs were supposed to be completed by Saturday 4th May, but the repair company only received authorisation from Discovery to complete the repairs on Friday 3rd May. I phoned Discovery 3 times on Saturday 4th to extend the period of the rental vehicle. I was sent from pillar to post, until eventually finding someone who could help me. He assured me that the rental period would be extended, and that somebody would contact me soon. Having heard nothing further from Discovery in the interim, I phoned them this morning (Monday 6th May), only to be informed that the vehicle should have been returned on Saturday, and that they would not be extending the period of the rental vehicle, and that the expense for the hired car had to covered by myself after Saturday 4th. I am a project manager, and my condition of employment is that I must provide my own vehicle. I am scheduled for a business trip to Piet Retief tomorrow and only returning on Friday 10 May. I now have no car to travel with. The service that I have received from Discovery Insure is shocking. It is the worst experience that I have ever encountered with an insurance company. Their call centre is an ordeal to deal with, and the operators either do not log calls correctly, or fail to respond with proper communication. I am now in a total quandary, as the company that I have trusted and paid to assist me in times of need have dropped the ball and have totally have failed me in my time of need, and even my job is in jeopardy. I am totally disappointed with a company that I have previously held in high regard.