36 days and no indication of completeness

I was in a car accident 16 April 2016 It took them 12 days (28 April) to do an assessment (Which was completely wrong) the car was then taken to Eljoney Body Works for repairs where Discovery never thought of checking if they will be open that short week which they were not. On Monday morning (4 may) I phoned Eljoney Body Works to confirm if they have received my car and was told they have not even heard of the car being sent to them that afternoon I received confirmation that my car was there. They picked up multiple other problems with the car (the ones I have mentioned from day one). A car cannot that hits you on your front tire at +- 100km/h will damage your undercarriage, but not according the assessment! My car was then sent to Autobox where I have received different dates of completeness. I received a mail 20th May that the repair will be done by today. Still no car! Now thanks for discovery they extended my rental with 10 days but that is not enough. If I have no say in where my car goes for repairs and they select a Panel beater and that panel beater is slow I should not suffer without a car. From 26 May I have no transport to work. I have to follow up the whole time.