Extreme poor service

My car was bumped and so a third party claim process started. Assessment was done incorrectly, then I took it to Renew-It Rivonia. They did a full assessment and provided a new quote for me to send to the assessors for approval. The total amount was substantially higher. The assessors are seated at the Renew-It Rivonia branch, but they can't seem to talk to each other. After a few days the story suddenly changed and they said that my bumper was in a previous accident, the bumper can't be replaced. Then after going there personally, it is sorted out. The bumper wasn't in a previous accident and can be replaced. The new quote is approved. All this is obviously delaying the entire process while I pay for a rental car.

Then suddenly they want to increase the amount. After an approval of a quote done by themselves. We said no. They accepted this.

Then they said the car will be fixed in 8 - 10 working days. We are on day 7 and the car is in parts ordering still. No work has been done. The car has to be ready by tomorrow or Friday according to their own calculation. Today is Tuesday. Still in parts ordering. So they expect me to believe that Audi doesn't keep bumpers in stock? I don't believe this.

The service is extremely poor and at no regard for the additional cost that I have to carry for a rental car. To simply quote for and replace a bumper is now taking 2.5 weeks and no work has been done on the car.