Bad service from service provider

We collected our vehicle on Saturday 8th December. And I had hoped that Miway chooses repair centers that will do a good repair work since they took the car from 7th November to 7th December - an entire month. To just repair the boot and bumper. Not brain surgery. Initial promised date was 21st November. And this was not met. Car was there for additional 2.5 weeks which we then lost income on. On Saturday the 15th when our driver was supposed to start working the boot wasn't working. Very unacceptable. The car has since gone back to Renew It on Tuesday again (18th December) which they now say the car will only be ready this afternoon (19th December). Renew clearly take in too much jobs and end up doing a terrible job. I am not happy with this service. This car was supposed to start working on Saturday and now we lost income from 15th - 19th December (5 days). Who is liable for this costs as it is not our fault? I expect Miway to pay for these days because Renew It is your service provider. You can claim if from them and next time work with reliable service providers who care about client satisfaction. Looking forward to your urgent response.