lack of expertise

it's four weeks now and they still don't know What's wrong or how to fix my car which I don't understand because they are supposed to be the experts.at least admitting it will be a start and refer me to someone who can help because it is clear that I am not going to get help anytime soon. I am tired of being taken from Durban to Cape Town without any estimated time or work to be done. I mean it's been a month, atleast offering me an alternative transport would be ideal considering my line of work which requires me to travel at night.