Incompetence-panel beating my vehicle

I was sent to Auto Magic by my insurance company Absa IDirect to have my car fixed as it was hit from the back. The company promised that it will be ready within 7 working days or else they will contact me. It has been 9 days since. On the 7th day they promised me it will be ready the following day, the following day the insurance company phoned them and they said today or Thursday, not a single call from them. Today I again asked the insurance company to find out if the part they claim was wrong arrived, they said yes but they will finish it next week or Tuesday. That makes it 3 weeks. This is my car and they will get paid for the most ugliest service, I have never experienced ****** until NOW and I see spitefulness, ****** lying characters fixing my car and I am worried that they will not do a good job. It is either they give my car in the condition that it was in so we can claim elsewhere, if they cant do the job then its fine because I seriously don't need their services, to top it they wont give me a courtesy vehicle to make up for their incompetence and the insurance company itself is not doing a good enough job to make sure I receive my car as promised.