Terrible Service and still no vehicle

I am incredibly disappointed with Renault . My vehicle has been in the workshop for over a week now and it still will not start and they can not tell me what the issue is . To begin off with my vehicle would not start and I had it towed in to Renault. Id had it there for 4 days and at each and every single occasion I had to call to find out what was going on When i did call the response I got was they are still working on it and I will call you back. Please note during this period of the first 4 days not once was i called back . At some point I called and I heard the conversation between the receptionist and the service manager and he told her to tell me that he was with a customer which i could clearly hear that he was not . Eventually on the Monday I called and I was told it was the steering box wiring that was causing the fault. So a new part was going to be ordered 5 days later the part has arrived and my vehicle still will not start. I am still paying for my vehicle and it is still under warranty. i have tried to be patient but there is so much a person can take . The fact that RENAULT itself can not tell me what is wrong with my car almost 2 weeks later is shocking . I am very disappointed . Can someone at RENAULT tell me what is wrong with my car and fix it.